Addition/Subtraction
Word Problems
Rounding/Estimation
Properties of Addition/Addition Patterns
Mental Math/Inverse Operations/Adding with Partial Sums
100

What is 452-249?

What is 203?

100

Jill need to read for 90 minutes to reach her goal. She read 39 minutes one day and 16 minutes another day. How much longer does she need to read to reach her goal?

Jill needs to read 79 more books.

100
Which numbers round to 400 when rounded to the nearest hundred?


350, 418, 499, 450, 480, 447

350, 418, 447

100

An odd number plus an odd number will always be____________?


Why?

An odd number plus an odd number will always be even because when you have two left overs it creates an equal group. 
100

Solve 509-348. Check your work using inverse operations. 

Answer- 161

Inverse- 348+161+ 509

200

439+429

868

200

Erin had 254 pairs of shoes. She gave 103 pairs to Sophie. Then, she bought 27 more pairs of shoes. How many pairs of shoes does she have now?

Erin has 178 pairs of shoes. 

200
Round 147 to the nearest 10. 

150

200
An even number plus an even number is always _____________________.


Why?

An even number plus an even number is always even because when you add even groups it always remains even. 
200

Solve 252+148. Use inverse operations to check your work. 

Answer- 400

Inverse Operations- 400-252= 148

300

648+167

815

300

Sara has 305 shirts in her closet. She gave 108 shirts to her sister. Then, she bought 81 more shirts. How many shirts does she have now?

Sara has 278 shirts. 

300

Round 147 to the nearest hundred.

100

300

An even number plus an odd number is always _______________________.


Why?

An even number plus an odd number is always odd because there is always one left over when creating groups. 

300

Solve 473+125 using partial sums.

400 + 100 = 500

70 + 20 = 90

3 + 5 = 8

500 + 90 + 8 = 598

400

1,000-389

611

400

There are 374 total animals on a farm. 101 of the animals are chickens and 67 of the animals are sheep. How many other animals are on the farm?

There are 206 animals on the farm. 

400

Estimate by rounding to the nearest hundred:


634-243

400

400

If you add two numbers in any order, will your sum be the same? Use an example to explain why or why not.

You can add two numbers in any order because when you use the Commutative Property of Addition, you can add numbers in any order and the sum will stay the same. 

400

Solve 53+36 using mental math.

50+30= 80

3+6= 9

80+9= 89

500

400-188

212

500

The third grade class needs to raise $450 for their class trip. On Monday, they raised $98 dollars. On Tuesday, they raised $292. How many more dollars to they need to raise to reach their goal. 

$60

500
Estimate by rounding to the nearest hundred:


780-250

500

500

Create two equations showing the Commutative Property of Addition. 

Answers may vary. 

500

Solve 25+73 using mental math. 

20+70= 90

5+3= 8

90+8= 98

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