Estimation Addition and Subtraction

Alexander has 59 toys in his room. Tiffany has 193 toys. About how many more toys does Tiffany have than Alexander? (round to the nearest ten)

• 100

• 250

• 130

• 300

Lucy packaged 346 cookies in March and 589 cookies in April. Which estimate below uses rounding to the nearest 10 to find how many more cookies she sold in April than in March?

• 600 - 300 = 300

• 590 - 350 = 240

• 580 - 350 = 230

• 590 + 340 = 930

James have 90 marshmallows in the jar. He adds 382 more. How many marshmallows are now in the jar? 

• 472

• 289

• 340

• 198

Estimate the difference using rounding: 9,193 - 2,024 =

• 7,000

• 200,000

• 11,000

• 15,000

Estimate the difference using rounding: 44,923 - 21,532 =

• 20,000

• 30,000

• 40,000

• 10,000

I traveled 452 miles one week, 317 the other, and 289 the third week. Which is the best estimate of the number of miles I traveled? 

• 1,100

• 1,300

• 900

• 800

Jordan read 485 pages last month and 391 pages this month. How many pages did Jordan read altogether?

• 866 pages

• 876 pages

• 886 pages

• 877 pages

What is the estimate of 55+24?

• 80

• 79

• 90

• 89

In a school storage room, there are 598 math workbooks and 346 vocabulary workbooks. Which number sentence shows the best way to estimate the total number of workbooks using rounding to the nearest 100?

• 350 + 600 = 950

• 300 + 500 = 800

• 300 + 600 = 900

• 300 + 650 = 950

If you have 845 and you subtract 279, what is the answer?

• 566

• 934

• 712

• 368