Use rounding to Estimate Sums
Use compatible numbers to estimate sums
word problems
Properties of Addition
round to the nearest 10 and 100
200

457+322

500+300=800

or

460+320=780

200

Estimate the sum of 432+489 using compatible numbers

425+475=900

or about 900

200

In the following number , which digit is in the ones place value:

724

4

200

Using the identity property of addtion tell what 7,891+0 is.

7,891

200

round 63 to the nearest 10

60

200

475+438

500+400=900

or

480+440=920

200

Estimate the sum of 428+286 using compatible numbers

425+275=700


Or about 700

200

Ada writes 10+8=18 on the board. Maria wants to use the Commutative Property of Additon to rewrite Ada's addition sentence. What number sentence should maria write? 

8+10=18

200

Give an example of the identity property of addition

3+0=3

or anything similar

200

Round 172 to the nearest Hundred

200

200

881+152

900+200=1,100

or

880+150=1,030

200

Estimate the sum of 327 + 581 using compatible numbers

325+600=925


or about 925

200

Marvella writes the addition problem 5+6. Is the sum even or odd?

Odd

200

what does the commutative property of addition state?

You can add two or more number in any any order and get the same sum

200

Round 155 to the nearest 10 and 100

Nearest ten: 160

Nearest hundred: 200

300

Jack read 72 pages on Sunday and 83 pages on Monday. ABout how many pages did Stephanie read during the two days?


Round to the nearest 10

70+80=150

300

Estimate the sum of 421+218 using compatible numbers

425+225=650


Or about 650

300

Write a number using the follow 3 digits:

1,2,3

Make sure that the 3 is in the hundreds place value.

312

or

321

300

what property of addtion does this show:

3+4=7 & 4+3=7

so, 3+4=4+3

Commutative property of addition

300

Mia's baseball is 32 inches long. What is its length rounded to the nearest 10 inches?

30

400

Seth bought a pair of sneakers for $48 and a jacket for $64. About how much money did seth spend on the sneakers and the jacket?

Seth spent about $110 on the sneakers and jacket.

400

Ryan counted 63 birds in his backyard last week. This week he counted 71 birds in his backyard. Use compatible number to find out about how many birds Ryan counted.

65+70=135


Or about 135

400

There are 372 workers at a software company. There are 483 workers at a lumber company. When rounding to the nearest hundred, which company has 400 workers?

The software company

400

Which property of addition states that 0 + any number=that number?

Identity property of addition

400

Cole says that 555 ronded to the nearest ten is 600. 

What is cole's error?

555 rounded to the nearest 10 is 560. 

Cole rounded to the nearest hundred instead of the nearest ten