Estimating and Adding Numbers

Round to the nearest 10, then estimate:
421 + 218 

• 650
• 640
• 645
• 639

Round to the nearest hundred, then estimate:
421 + 218 

• 600
• 640
• 700
• 650

Round to the nearest ten, then estimate:
27 + 78

• 115
• 90
• 100
• 110

Round to the nearest 10, then estimate:
465 + 478 

• 1,000
• 940
• 950
• 943

Round to the nearest ten, then estimate:
267 + 517 

• 790
• 780
• 795
• 775

Round to the nearest 100, then estimate:
267 + 517 

• 790
• 800
• 700
• 795

Round to the nearest tens, then estimate:
11 + 48 = 

• 59
• 60
• 70

Round to the nearest tens, then estimate:
18 + 61 = 

• 80
• 79
• 90

Round to the nearest hundred, then estimate:
214 + 671 = 

• 800
• 900
• 885

Round to the nearest hundred, then estimate:
610 + 382 = 

• 992
• 900
• 1,000