Kelly subtracted 2.3 from 20 and got 17.7. Explain why this answer is resonable.

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To explain why the answer 17.7 is reasonable when subtracting 2.3 from 20, we can perform the subtraction operation and verify the result.

Step 1: Subtract 2.3 from 20
20 - 2.3 = 17.7

Kelly's calculation correctly arrived at the answer 17.7. However, to further understand the reasonableness of this result, we can apply a simple estimation technique.

Estimation Technique:
When subtracting a number like 2.3 from 20, we can round both numbers to the nearest whole number for a quick approximation.

Step 1: Round 2.3 to the nearest whole number
2.3 rounds to 2

Step 2: Round 20 to the nearest whole number
20 rounds to 20

Step 3: Perform the subtraction operation using the rounded numbers
20 - 2 = 18

The estimation gives us an approximate result of 18, which is reasonably close to the exact result of 17.7 obtained through the calculation.

Hence, based on both the exact calculation and the estimation, we can conclude that the answer of 17.7 obtained by Kelly is reasonable.

2.3 is a little more than 2.

20 - 2 = 18

17.7 is a little less than 18.

Does this make sense to you?

that is easy because God helped me