Sums and Differences

Round to the nearest hundred to estimate the sum.
479 + 432 = 

• 800

• 1,000

• 900

• 100

Estimate the difference of 7,900-2,999 by rounding to the nearest thousands

• 6,000

• 4,000

• 5,000

• 3,000

Estimate the sum: 1,432+1,564

• 2,000

• 2,100

• 2,996

• 3,000

• 500 + 100 = 600
• 500 - 100 = 400
• 600 + 100 = 700
• 600 + 200 = 800

• 300 - 200 = 100
• 300 + 200 = 500
• 400 - 200 = 200
• 300 + 200 = 500

• 900 - 300 = 600
• 900 - 200 = 700
• 1,000 - 200 = 800
• 900 + 300 = 1,200

• 300 + 100 = 500
• 300 + 100 = 400
• 300 - 100 = 200
• 400 + 100 = 500

Fill in the blank to step 1 of the estimation plan.

__________ both numbers to the nearest ten.

• Round

• Add

• Subtract

• Count

What is the estimate of 55+24?

• 80

• 79

• 90

• 89

What is the estimate of 69-27?

• 40

• 42

• 100

• 30