Question

round each number to the nearest whole number first, then estimate.
23.79 + 5.54
? + =
enter the number that belongs in the green box!

Explanation:

Step1: Round 23.79 to nearest whole

The tenths digit is 7, which is ≥5, so round up: $23.79
ightarrow 24$

Step2: Round 5.54 to nearest whole

The tenths digit is 5, which is ≥5, so round up: $5.54
ightarrow 6$

Step3: Estimate the sum

$24 + 6 = 30$

Answer:

24