Unit 4 Math Review

Add/Subtract 10 or 100

100

9 +10 = ?

19

200

23 + 10 = ?

33

300

127 + 100 = ?

227

400

462 + 100 = ?

562

500

922 + 100 = ?

1,022

Expanded Form

100

63 - 21 = ?

  60 + 3

- 20 + 1

________

   40 + 2 = 42

200

327 + 112 =?

   300 + 20 + 7 

+ 100 + 10 + 2

______________

400 + 30 + 9 = 439 

300

682 - 127 = ?

   600 + 80 + 2

-  100 + 20 + 7

______________

      500+50+5 = 555

400

382 + 175 = ?

   300 + 80 + 2 

+ 100 + 70 + 5

_____________

 500 + 50 + 7 = 557

500

427 - 144 = ?

  400 + 20 + 7 

- 100 + 40 + 4

_____________

    200+80+3 = 283

Number Line

100

124 + 15 = 

124 -> hop 10 to 134

134 -> hop 5 to 139

SUM = 139 

200

216 + 132 = 

start at 216

hop 100 to 316 

hop 30 to 346

hop 2 to 348 

SUM = 348 

300

547 - 132 = ?

start at 132 

hop 400 to get 532

hop 10 to get 542 

hop 5 to get 547 

DIFFERENCE = 415 

400

382 + 175 = 

Start at 382 

hop 100 to get to 482 

hop 70 to get to 552

hop 5 to get to 557 

SUM = 557 

500

427 - 144 = 

start at 144

hop 200 to 344

hop 80 to 424

hop 3 to 427 

DIFFERENCE = 283 

1 step word problems

100

Oliviana had 32 pens. Naomi gave her 13 more. How many pens does Oliviana have now?

Oliviana has 45 pens.

200

Sebastian had 82 cookies. He gave Leo 42 cookies. How many cookies did Sebastian have left?

Sebastian had 40 cookies left. 

300

Kristina had 236 stickers. She gave Mara 122 of them. how many stickers did Kristina have left?

Kristina had 114 stickers left. 

400

There were 627 trees in a park and 159 were cut down. How many trees were left in the park?

There were 468 trees left in the park.

500

Ms. Ma had 526 students. Ms. Liotto had 612 students. What is the difference between Ms. Ma's students and Ms. Liotto's students?

The difference is 86 students

2 step word problems

100

There were 45 fish in the tank. A girl came in and bought 22 fish. The store added 37 more fish at the end of the day. How many fish were in the tank at the end of the day?

There were 60 fish in the tank. 

200

Dad caught 22 fish in the morning. He threw 5 back into the water because they were too small. After lunch he caught 12 more fish. How many fish did dad have then?

Dad had 29 fish. 

300

Greg went to the library and took out 47 books. He returned 14 of them. Later in the week he returned 28 more. How many books does he still have?

Greg had 5 books left. 

400

 There were 524 balls in a ball pit. Kids took out 142 of the balls. Then, they put back 112. How many balls were left in the ball pit?

 There were 494 balls left in the ball pit.

500

Kelly has a collection of 247 stickers. Her mom gives her a set of 150 more stickers for her birthday. Kelly gives her little sister 115 of her stickers. How many stickers does Kelly have left?

Kelly had 142 stickers left.