Explain how you could estimate 22% of 78 to check if your answer is reasonable.

Solution:

Given, 22% of 78.

Estimation of a number is a reasonable guess of the actual value to make calculations easier and realistic.

Estimation means approximating a quantity to the required accuracy.

This is obtained by rounding off the numbers involved in the calculation and getting a quick and rough answer.

78 rounds to 80.

So decrease 22% to 1/5.

Increase 78 to 80.

80/5 = 16( approximate to 17.16)

Or

22% = 22/100

22% of 78 = 22 × 78 /100 = 1716/100

= 17.16.

Therefore, the estimate of 22% of 78 is 17.16

---

Explain how you could estimate 22% of 78 to check if your answer is reasonable.

Summary:

Reasonable answer for the estimation of 22% of 78 is 17.16