Rounding to Estimate Sum and Difference

Estimate Sums Using Rounding

add and round the sum

Round then estimate the sum

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Multiple Choice

$$Round\ to\ the\ nearest\ 100\ then\ estimate\ the\ sum$$   $$256\ +\ 189\ =\$$  

• 300

• 400

• 500

Multiple Choice

$$Round\ to\ the\ nearest\ 100\ then\ estimate\ the\ sum$$ $$112\ +\ 571\ =\$$  

• 500

• 600

• 700

Multiple Choice

$$Round\ to\ the\ nearest\ 100\ then\ estimate\ the\ sum$$ 1250 + 1460

• 2800

• 3000

• 2900

Multiple Choice

$$Round\ to\ the\ nearest\ 10\ then\ estimate\ the\ sum$$ 12 + 21 = 

• 20

• 30

• 40

Multiple Choice

$$Round\ to\ the\ nearest\ 10\ then\ estimate\ the\ sum$$ 47 + 38 = 

• 80

• 90

• 100