questions about numbers

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18
votes
7answers
719 views

Why the vast difference of opinion about the age of the Universe?

5770 and 13,000,000,000 is a big difference! I am looking for a good explanation to the difference opinion of the age of the universe. Please help me out!
15
votes
2answers
1k views

How many of the 613 Mitzvos can we do only in Israel?

There are many Mitzvos we can not do in today's generation. For example there are no Korbonos, no slaves, etc. Per the Chofetz Chaim, there are 77 positive Mitzvos and 194 negative Mitzvos which can ...
8
votes
20answers
346 views

Shelosha - mi yodeya?

Who knows three? Please cite/link your sources, if possible. In about a day, I will: Upvote all interesting answers. Accept the best answer. Go on to the next number.
19
votes
2answers
249 views

Why the custom to switch around negative-sounding numbers, such as שד?

Often in sefarim we find that if the number of the siman spells out something negative, such as siman 304 which has a letter value of שד, we switch it around so it no longer reads as a "bad" word. ...
8
votes
2answers
222 views

How could the numerals יה and יו be used irreverently?

I was told that in the sequence of numerals with Hebrew letters, the numbers 15 and 16 are rendered with טו and טז instead of יה and יו to prevent the tetragrammaton from being formed irreverently. ...
7
votes
2answers
303 views

Why when washing for bread do we splash twice?

Is there any particular reason the procedure for washing hands for bread includes pouring the water twice on each hand? Isn't once enough?
1
vote
1answer
542 views

How many prophets were there and who were they?

How many prophets are recognized by Judaism, and what were their names? I found a website that claims the number of prophets is 124000. Is this true? Are all of their speeches or writings ...
10
votes
43answers
609 views

Meya - mi yodeya?

Who knows one hundred? Please cite/link your sources, if possible. At some point in the future, subject to holiday and user activity delay, I will: Upvote all interesting answers. Accept the best ...
16
votes
4answers
1k views

Is there a list of Mitzvot and their corresponding body parts?

The Talmud (Makkot 23B)and the Zohar (1:170B - unverified English translation here) say that the 248 positive commandments correspond to the 248 limbs of the human body. (The Mishna (Ohalot 1:8) lists ...
14
votes
2answers
430 views

Which mitzvah is repeated the most times in the Chumash?

I have learned that not mixing milk and meat is mentioned 3 times in the chumash, and because of this we learn 3 different laws. I also found out today that the law "not to follow the ways of the ...
12
votes
3answers
390 views

What happened to the bechorim (first-borns)?

In the begining of sefer bamidbar, the males between 20 and 60 are counted and it says that there are over 600,000 of them. Theoretically each, or most, of these people should have had a first-born ...
2
votes
11answers
240 views

Echad Ve'esrim - mi yodeya?

Who knows twenty-one? Please cite/link your sources, if possible. After about one business day, I will: Upvote all interesting answers. Accept the best answer. Go on to the next number.
16
votes
3answers
267 views

the aggadic concept of a finite number of words to speak

Is there any truth to the common claim that each person has a predetermined number of words that he can speak in his life? Source, please. If so, then how does it work? In particular (with sources or ...
8
votes
1answer
193 views

Halachic significance of the plurality of Jews living in Israel

I once heard that if Israel has the largest Jewish population, it has a significant effect on certain Halachot. What are the criteria for this, and what halachot are affected? (Shmita is the one most ...
6
votes
36answers
555 views

Arba'a - mi yodeya?

Who knows four? Please cite/link your sources, if possible. After Shabbat, I will: Upvote all interesting answers. Accept the best answer. Go on to the next number.
13
votes
17answers
411 views

Shelosh Meyot - mi yodeya?

Who knows three hundred? ?שלוש מאות - מי יודע In the spirit of the song "Echad - mi yodeya", please post interesting and significant Jewish facts about the number 300. Check out mi-yodeya-series ...
10
votes
19answers
391 views

Shiv'a - mi yodeya?

Who knows seven? (I mean really, who doesn't?) Please cite/link your sources, if possible. In about one business day, I will: Upvote all interesting answers. Accept the best answer. Go on to the ...
8
votes
12answers
163 views

Chamisha - mi yodeya?

Who knows five? Please cite/link your sources, if possible. In about a day, I will: Upvote all interesting answers. Accept the best answer. Go on to the next number.
7
votes
1answer
206 views

Criteria for the list of Nashim Kesheiros (Medrash Breishis Rabsi)

The Medrash Breishis Rabsi Parshas Chaya Sara 23:1 lists 22* Nashim Kesheiros. כ"ב נשים כשרות היו בעולם ואלו הן שרה, רבקה, רחל, לאה, סרח בת אשר, יוכבד, מרים, בתיה בת פרעה, דבורה, צללפונית אשת מנוח, ...
7
votes
29answers
400 views

Shiv'im - mi yodeya?

Who knows seventy? Please cite/link your sources, if possible. At some point in the next few days, I will: Upvote all interesting answers. Accept the best answer. Go on to the next number.
6
votes
4answers
86 views

Arba'a Ve'esrim Ushlosh Meyot - mi yodeya?

Who knows three hundred twenty-four? ?ארבעה ועשרים ושלוש מאות - מי יודע The traditional Passover song "Echad - mi yodeya" implies a possible presupposition that there is a Jewish significance to be ...
6
votes
1answer
99 views

Source for # times chai?

I often see donation requests with amounts in multiples of $18. I would like to know the source for giving charity of the numeric value of the Hebrew word chai (18) and its multiples.
6
votes
1answer
91 views

Why does the tribe of Gad have an unusual population count in Bamidbar 1?

When listing the census of the tribes in Bamidbar 1, only the tribe of Gad has the count 45,650 - I.e. - the count is not exactly on the hundreds as it is with all the other tribes. As the count was ...
3
votes
3answers
158 views

Shemona Ushmonim Umatayim - mi yodeya?

Who knows two hundred eighty-eight? ?שמונה ושמונים ומאתים - מי יודע In the spirit of the song "Echad - mi yodeya", please post interesting and significant Jewish facts about the number 288. This ...
3
votes
5answers
107 views

Shemona Ve'arba'im Umatayim - mi yodeya?

Who knows two hundred forty-eight? Please cite/link your sources, if possible. At some point at least twenty-four hours from now, I will: Upvote all answers I consider relevant and interesting. ...
2
votes
3answers
108 views

Shnayim Veshishim Umatayim - mi yodeya?

Who knows two hundred sixty-two (262)? Please cite/link your sources, if possible. At some point between twenty-four hours and a few days from now, I will: Vote up all interesting, relevant ...
2
votes
5answers
1k views

A natural explanation for the significance of the numbers 7 and 40

In the Jewish religious texts the numbers 7 and 40 seem to appear quite often and carry special significance. Some examples among many: God's creation lasts 7 days The Great Flood was from rain ...
2
votes
5answers
76 views

Shiv'a Asar Umeya - mi yodeya?

Who knows one hundred seventeen? Please cite/link your sources, if possible. At some point at least twenty-four hours from now, I will: Upvote all interesting answers. Accept the best answer. Go on ...
0
votes
1answer
160 views

Pidyon HaBen rate

About how many pidyon haben ceremonies are required to be performed per 1000 Jewish births in the past few decades? The requirements for a pidyon haben are: Both parents are Israel, not Kohen or ...
4
votes
1answer
604 views

Why isn't the Kabbalistic doctrine of Sefirot considered Shittuf if the Christian Trinity is?

From the answers to this question it seems that most if not all Jewish sources treat Trinitarian Christianity (in particular, their doctrine of the Trinity) as either Shittuf or outright Avoda Zara, ...
14
votes
2answers
201 views

Lechem Mishneh by the Third Shabbos Meal

Is one required to have Lechem Mishneh by the Third Shabbos Meal?
13
votes
3answers
519 views

Can someone have more than one potential soulmate simultaneously?

I have been told from several different people that it is possible for one person to have multiple Besherts (divinely intended marriage partners, soulmates if you will) to choose from. He may only ...
12
votes
2answers
203 views

The 500 men killed in Shushan, and the 500 Jews who killed Amaleki

Is there a source to connect (mystically, or otherwise) those enemies of the Jews (presumably Amaleki) killed in Megillas Esther 9:12 with the 500 men from the tribe of Shimon who killed out the ...
10
votes
2answers
266 views

What are the 30 Mitzvot for Bnei Noach?

What are the 30 Mitzvot (Commandments) that Bnei Noach have accepted (based on Hullin 92a)? שלשים מצות שקבלו עליהם בני נח.‏ Thirty commandments which Bnei Noach accepted upon themselves.
3
votes
2answers
413 views

Minimum Number of Days before Hefsek Tahara: Sephardi vs. Ashkenazi

Why do Sepharadi keep a minimum of four days and Ashkenazi keep a minimum of 5 days before hefsek tahara? What is the underlying reason behind this difference?
7
votes
6answers
169 views

Number of Candles at Lighting

How many candles should one light on Erev Shabbos and Yom Tov? And why that number?
6
votes
2answers
219 views

Why is one permutation of the name of God backwards?

If you spell out each letter that makes up the name of God, then add up the gematria (numerical value) of each letter of each fully spelled out letter you get various values. The value depends on how ...
5
votes
15answers
122 views

Arba'a Ve'esrim - mi yodeya?

Who knows twenty-four? Please cite/link your sources, if possible. After about one business day, I will: Upvote all interesting answers. Accept the best answer. Go on to the next number.
2
votes
1answer
135 views

What does “rov am hadrat melech” mean?

I was under the impression that from the literal word for word interpretation, that רוב עם הדרת מלך meant literally most of nation respects the king. Does this mean that it applies when only three ...
12
votes
5answers
228 views

What is the nature of the numeral “ashtei-asar” (11)?

What is the nature of the numeral ashtei-asar (meaning 11) as in וּבַיּוֹם הַשְּׁלִישִׁי פָּרִים עַשְׁתֵּי-עָשָׂר (Pinchas 29:20): What is the basic word? Is this using semichus, as in ashtaim of ...
9
votes
3answers
197 views

How did Avrohom learn that nine doesn't work?

The Midrash says (Bereshis Rabbah 49:13 quoted in Rashi Genesis 18:32) that Abraham stopped asking HaShem to save Sodom in the merit of less than 10 people because Noah and his family who were 8 ...
7
votes
1answer
144 views

Why celebrate Lag Ba'Omer on the 33rd according to the MaHaRIL?

There are several different opinions about when the students of Rabbi Akiva died, and which days we mourn for them. Sefer HaToda'ah quotes the Maharil, who says that the students of Rabbi Akiva died ...
7
votes
2answers
280 views

Saying 100 Berachoth in a day

What is the source for the idea that one should say 100 Berachoth in a day, and how serious of an obligation is this? Is it mandatory, is it laudatory, or is it merely a nice idea?
6
votes
2answers
80 views

Asara Ushlosh Meyot - mi yodeya?

Who knows three hundred ten? ?עשרה ושלוש מאות - מי יודע In the spirit of the song "Echad - mi yodeya", please post interesting and significant Jewish facts about the number 310. There is lazy ...
6
votes
2answers
252 views

How many T'fachim make up an Ama?

Is it possible to convert between Torah measurements? Specifically, T'fachim & Amot, (cubits) so I can figure out the size of the luchot (tablets) within the Aron Hakodesh (ark). (The Luchot are ...
6
votes
6answers
489 views

Bedikas Chometz - 10 pieces of bread

In Shulchan Aruch Orach Chaim 432:2 the Rama says that the Minhag is to place bread in such a place that the searcher can find it. Both the Be'er Hataiv and the Mishna Berura say that according to the ...
6
votes
3answers
324 views

Why do some pairs of Tzitzit have one hole on each corner and some have two?

There are Tzitzit that have one hole and some have two. What is the significance of the multiple holes? Whose custom is it to have one? Whose custom is it to have two?
6
votes
7answers
280 views

Echad - mi yodeya?

Who knows one? Please cite/link your sources, if possible. In about a day, I will: Upvote all interesting answers. Accept the best answer. Go on to the next number.
5
votes
1answer
148 views

Parshas Tzav - 96 Pesukim?

At the end of each Parsha many Chumashim have the number of Pesukim that are in that Parsha. By Parshas Tzav they all say 96 which is the Gematria of Tzav צו. However if counted there are 97 Pesukim. ...
5
votes
12answers
137 views

Shnayim Ve'arba'im - mi yodeya?

Who knows forty-two? Please cite/link your sources, if possible. At some point in the next few days, I will: Upvote all interesting answers. Accept the best answer. Go on to the next number.