Vocabulary
Tens
Hundreds
Problem Solving
Rounding
100

( 2 + 5 ) + 1 = 2 + ( 5 + 1 )

Associative Property of Addition

100

What is 9+19

28

100

What is 32+68

100
100

A horse weighs 1,723 pounds. A smaller horse weighs 902 pounds. How much do both horses weigh together?

2,625 pounds

100

Round to the nearest 10 then add:

198 + 132

200 + 130 = 330

200

12 + 15 = 15 + 12

Commutative Property of Addition

200

What is 29+67

96

200

What is 30+89

119

200

Brandon scores 107 points in Fortnite. Jaden scores 111 points in the same game. How many points do they score in all?

218

200

Round to the nearest 10 then add:

725 + 229 

730 + 230 = 960

300

3 + 0 = 3

Identity Property of Addition

300

What is 57+32

89

300

What is 405+23

428

300

Briella bakes 10 snacks for a bake sale. Santiago bakes 33 snacks for the bake sale. How many snacks do they bake in all?

43

300

Round to the nearest 10 then add:

43 + 82

40 + 80 = 120

400

Ordering or grouping numbers so they are easier to add in your head. 

Mental Math

400

What is 14+78

92

400

What is 11+ 89

100

400

A golf ball has 336 dimples. How many dimples would there be in 3 golf balls?

1,008

400

Round to the nearest 100 then add:

1,274 + 3,599

1,300 + 3,600 = 4,900

500

A set of numbers that follows a certain order

Pattern

500

What is 30 + 30

60


500

What is 230+40

270

500

Santiago has 245 books. Alex gives him 80 books to add to his collection. But... Mr. Justin decides to steal their entire collection and add it to his existing 15 books. How many books does Mr. Justin have now (muahahaha).

340

500

Round to the nearest 100 then add:

8,291 + 1,101

8,300 + 1,100 = 9,400