Addition and Subtraction with Rounding

Estimate how many more miles were run last year than this year by rounding each number in the table to the nearest hundred and solving the problem

Glenn used addition properties to rewrite the equation below. Select ALL the equations Glenn might have written.

• 3,010 + 1,505 + 2,370 = n

• 3,010 + 1,505 = n

• 3,000 + 2,300 + 1,500 = n

• (2,370 + 3,010) + 1,505 = n

• (3,000 + 2,300 + 1,500) + (10 + 70 + 5) = n

Estimate

• finding an answer that is reasonable by rounding the numbers in an equation

• price the guy gives you before fixing your car

• rounding numbers 

• over spending at the movies

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

Nathan has 354 stickers. Grace has 216 stickers. How many stickers do Nathan and Grace have altogether?

• 560 stickers

• 570 stickers

• 142 stickers

• 128 stickers

There were 41 girls and 37 boys in the lunchroom. What was the total number of girls and boys in the lunchroom?

• 4 students

• 68 students

• 78 students

• 79 students

The club sold 239 coupon books on Wednesday and 446 books on Thursday. How many books were sold in all?

• 685 books

• 675 books

• 655 books

• 645 books

What is 83 rounded to the nearest 10?

• 90

• 80

• 84

• 100

Ramon practiced 325 math fast facts during one week. He practiced 45 facts the first day and 112 facts the second day. How many facts did he practice during those two days?

• 147 facts

• 213 facts

• 157 facts

• 280 facts