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# How do you subtract 21-8 by using a Number line from 20 to 50?

Updated: 11/4/2022

Wiki User

9y ago

Since your number line starts at 20, add 20 to your figures and you will come up with the same answer.

21 - 8 = 41 - 28 = 13

Wiki User

9y ago

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Q: How do you subtract 21-8 by using a Number line from 20 to 50?
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### How can you subtract two 3 digit number using numbers 1-9 once only with the spare numbers forming the answer?

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### What can divide into 219 and 18 evenly?

The product of the prime factors of 218 is 218. The prime factors of 218 are 2 and 109, making their product 2 x 109 = 218! I wouldn't expect it to be otherwise: the product of the prime factors of a number equal the number.