Mental Math Estimate Sums and Differences

4,592 + 3,219 = 

• 7,811

• 1,373

• 7,701

• 1,387

Round to the nearest thousand, then estimate the sum:

2,764 + 4,851

• 7,000

• 6,000

• 5,000

• 8,000

Use compatible numbers to estimate the value of 76 + 26.

• 75 + 25 = 100.

• 80 + 30 = 110

• 76 + 26 = 102

• 70 + 20 = 90

Subtract 432 from 789. What is the difference?

• 512

• 357

• 245

• 678

Mrs. Wright went shopping on Saturday. She spent $134 at the grocery store, $48 at the mall and $181 at the sports store. What is the best estimate of how much money Mrs. Wright spent on Saturday?

• $365

• $363

• $360

• $250

Subtract 432 from 789. What is the difference?

• 512

• 357

• 245

• 678

Rick feeds his cats 24oz of food each day. What is the best estimate of the number of ounces of food he will feed them in the Month of March which is 31 days?

• 600

• 900

• 800

• 750

What is the result of 654 minus 287?

• 367

• 276

• 532

• 429

What is the result of 654 minus 287?

• 367

• 276

• 532

• 429

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

• 566

• 934

• 712

• 368