questions about numbers

learn more… | top users | synonyms

20
votes
7answers
890 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
380 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.
8
votes
2answers
247 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. ...
19
votes
2answers
263 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. ...
17
votes
4answers
2k 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 ...
7
votes
2answers
332 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?
7
votes
6answers
197 views

Number of Candles at Lighting

How many candles should one light on Erev Shabbos and Yom Tov? And why that number?
16
votes
1answer
452 views

When Israel and the diaspora are out of sync on parshiyot, why don't we take the first opportunity to re-align?

This year (5772) the seventh day of Pesach is on a Friday, so the diaspora has an 8th day of chag on Shabbat but Israel does not. The diaspora will thus read Sh'mini on April 21, Tazria-Metzora on ...
14
votes
3answers
897 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, ...
1
vote
1answer
616 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
42answers
635 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 ...
14
votes
2answers
540 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
413 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 ...
4
votes
10answers
153 views

Shnayim Ve'esrim - mi yodeya?

Who knows twenty-two? 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
6answers
119 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
11answers
265 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
281 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 ...
10
votes
2answers
315 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
36answers
571 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.
2
votes
5answers
2k 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 ...
13
votes
17answers
432 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
20answers
408 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
168 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
210 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
421 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
1answer
113 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
120 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 ...
6
votes
9answers
328 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
213 views

Were there more than seven prophetesses?

The Bavli, M'gila 14:1 quotes: Forty-eight prophets and seven prophetesses prophesied for the Jews…. Further along on the page, it questions this: Were there no more? But it says [in ...
4
votes
4answers
101 views

“And it was evening, and it was morning, *one* day”?

Gen. 1:5: וַיְהִי עֶרֶב וַיְהִי בֹקֶר יוֹם אֶחָד And it was evening, and it was morning, one day Gen. 1:8: וַיְהִי עֶרֶב וַיְהִי בֹקֶר יוֹם שֵׁנִי and it was evening, and it was ...
4
votes
3answers
71 views

12 hours to the day, 12 hours to the night

Why is a day and night divided into 12 hours? Why not 10 hours? What is the significance of 12?
3
votes
3answers
160 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 ...
2
votes
3answers
109 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
77 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
196 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 ...
14
votes
2answers
222 views

Lechem Mishneh by the Third Shabbos Meal

Is one required to have Lechem Mishneh by the Third Shabbos Meal?
13
votes
3answers
621 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
208 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 ...
8
votes
2answers
661 views

The blessing for 600,000 Jews

The Gemara (Berakhot 58b) mentions that upon seeing 600,000 Jews one says the blessing "Baruch...Chacham HaRazim" (Who knows all secrets), and this is halacha (Sh.A. O.C. 224:5). Does any know of any ...
8
votes
1answer
214 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
2answers
282 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
124 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.
4
votes
1answer
90 views

Why are disputes in pairs?

The final paragraph of this answer: We do have the tools to derive from the Torah what those Halachos are (Moshe Rabeinu taught them to us), but these rules are very general in nature and ...
3
votes
1answer
195 views

How was Moses able to speak to at least 600,000 people?

The book of Exodus says that Israelites had 600,000 men of fighting age. And often it has paragraphs like this: Exodus 35:4 (JPS): And Moses spoke unto all the congregation of the children of ...
3
votes
2answers
570 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?
3
votes
0answers
149 views

Relations twice as segulah for boy — What about zugos?

I had asked what is the source for the segulah of having relations twice in order to have a boy. I first asked this in order to obtain a source to better ask this question. The Gemorah says in Niddah ...
2
votes
1answer
145 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 ...
2
votes
2answers
590 views

How many Kosher animals were in Noach's Ark?

How many animals total of each Kosher species were in the teivah during the flood?
15
votes
8answers
592 views

Why is “Shalom Aleichem” always plural?

Why do we say Shalom Alaichem to one person if Alaichem is plural? Is it saying you and all of the Jews? Is that why it's plural?