Estimating and Finding Sums and Differences

Estimate the SUM:
9.1 + 7.9

• 15
• 17
• 18
• 2

Estimate the DIFFERENCE: 
20.2 - 10.3

• 10
• 19
• 22
• 18

Round to the nearest 100 to estimate the difference:

510 - 396 =

• 200

• 300

• 100

• 400

• 140

• 160

• 130

• 200

• 400

• 500

• 600

• 700

Estimate the Sum:

87 + 42 =

• 100

• 130

• 120

• 125

Estimate the Sum:

529 + 285

• 880

• 700

• 80

• 800

• 500 - 200 = 300
• 600 - 200 = 300
• 600 - 200 = 400
• 500 - 200 = 200

• 400 + 200 = 600
• 500 + 200 = 700
• 500 - 200 = 400
• 500 - 200 = 300

• 400 + 200 = 600
• 500 + 200 = 600
• 500 + 200 = 700
• 400 + 200 = 700