questions about numbers

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18
votes
6answers
611 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!
13
votes
2answers
796 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 ...
6
votes
20answers
336 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
240 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
211 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. ...
10
votes
43answers
572 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 ...
7
votes
2answers
262 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?
15
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 ...
1
vote
1answer
448 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 ...
8
votes
1answer
171 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
35answers
544 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
407 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 ...
13
votes
2answers
374 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 ...
11
votes
2answers
339 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 ...
9
votes
19answers
378 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 ...
7
votes
1answer
180 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
388 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.
3
votes
3answers
131 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
106 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
106 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
69 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 ...
2
votes
11answers
225 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.
1
vote
0answers
128 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 ...
13
votes
2answers
188 views

Lechem Mishneh by the Third Shabbos Meal

Is one required to have Lechem Mishneh by the Third Shabbos Meal?
13
votes
3answers
218 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 ...
12
votes
2answers
201 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 ...
12
votes
3answers
453 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 ...
10
votes
2answers
239 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.
6
votes
2answers
181 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 ...
4
votes
15answers
118 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.
11
votes
5answers
205 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
182 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
2answers
248 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?
7
votes
6answers
162 views

Number of Candles at Lighting

How many candles should one light on Erev Shabbos and Yom Tov? And why that number?
7
votes
12answers
145 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.
6
votes
2answers
78 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
227 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
478 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
291 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?
5
votes
1answer
127 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
11answers
129 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.
5
votes
7answers
265 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.
4
votes
0answers
43 views

Yakkov living in Egypt 17 years - connection to 210 years of servitude

Parshas Vayechi starts off that Yaakov lived in Egypt for 17 years. I was thinking that 17 years x 12 months = 204 months. Usually in 17 years there are 6 leap years which would increase the total ...
4
votes
3answers
83 views

Shemona Vetish'im Umatayim - mi yodeya?

Who knows two hundred ninety-eight? ?שמונה ותשעים ומאתים - מי יודע In the spirit of the song "Echad - mi yodeya", please post interesting and significant Jewish facts about the number 298. I wash ...
4
votes
1answer
333 views

Tzitzit tying: the real way

1)There are two authentic ways to tie the Sisit (Tzitzis) that have sources. Maran writes to make 7-9-11-13. First question: why does he write this is he then says Gimtarya Hashem is One, when in fact ...
4
votes
3answers
90 views

Shnayim Umeya Va-elef - mi yodeya?

Who knows eleven hundred two? 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 to ...
4
votes
13answers
144 views

Chamisha Asar - mi yodeya?

Who knows fifteen? 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.
3
votes
0answers
89 views

How many approaches to Torah are there?

Our sages tell us that there are שבעים פנים לתורה (Bamidbar Rabbah). Does this mean that every word, or verse, or some unit, has 70 interpretations, and there are theoretically billions of ...
3
votes
2answers
108 views

What is the problem with writing שט as a number?

In Hebrew, numbers are represented by letters. When these letters spell out something unpleasant or undesirable, they are moved around. An example is שד which means “demon” becomes דש in the Mishna ...