Estimating Sums of Single Digit Numbers

Which of the following represents the most accurate estimation of 4 + 8? is the answer 5, 10, 20 or 25

Question

Damaris

24 March, 11:16

+3

Answers (1)

Know the Answer?

Bart · Answer 1

10

We can round 4 down to 0 since it is less than 5 and round 8 up to 10 since it is greater than 5. Giving:

0 + 10 = 10

Estimating Sums of Single Digit NumbersWhich of the following represents the most accurate estimation of 4 + 8? is the answer 5, 10, 20 or 25