What are multiplication problems that equal 21?

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What are multiplication problems that equal 21?

3 x 7 = 21. 7 x 3 = 21. 21 x 1 = 21.

How do you play 21 for beginners?

Play basic strategy

  1. Stand when your hand is 12-16 when the dealer has 2-6.
  2. Hit when your hand is 12-16 when the dealer has 7-Ace.
  3. Always split Aces and 8s.
  4. Double 11 versus the dealer’s 2-10.
  5. Hit or double Aces-6.

What 4 numbers add up to 21?

Good luck! Hence the 4 numbers are 4, 12, 20 and 64.

What is the sum of the factors of 21?

32
Therefore the factors of 21 are 1, 3, 7 and 21. All that is left to do is to work out the sum of these numbers, that is to add them all up. 21+1 + 3 +7 = 32Therefore, the sum of the factors of 21 is 32.

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How do you work out 2/3 of a number?

To find 2/3 of a whole number we have to multiply the number by 2 and divide it by 3. To find two-thirds of 18, multiply 2/3 x 18/1 to get 36/3.

Is 21 = (1+2+4)*3?

With 2 and 4 it doesn’t work, so we can have 21= [1,2,4]*3 or 7= [1,2,4]. The only combination in this variant is to have 7=1+2+4 and thus 21= (1+2+4)*3. It seems from another answer that even doing this isn’t enough. Let’s try to factor 21. It is 3*7, maybe 1*3*7 though this doesn’t help.

How do you get 21 from 2x2x3x4?

Basically, what you need to do is find a way to multiply/add the numbers so they give you 21. If you multiply them all by each other; 1 x 2 x 3 x 4, they give you 24. If you add them all together: 1 + 2 + 3 + 4, they give you 10.

What is the easiest way to find 21 from 20 and 1?

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It’s quite simple. Then add 20 + 1 = 21. Basically, what you need to do is find a way to multiply/add the numbers so they give you 21. If you multiply them all by each other; 1 x 2 x 3 x 4, they give you 24.

How many numbers can you use only 1 2 3 and 4?

You can use only the digits 1, 2, 3 and 4 once in each and the operations + – * / . So, here goes… 1 to 50, using only 1, 2, 3 and 4 and the basic maths operators. Some of the answers seem a little repetitive or derivative (look at 38 through 43), and in some cases I found alternative answers afterwards.