Unit 3 Math Review

Place Value

100

Create the place value drawing for 375. 

3 Squares 

7 Sticks 

5 Dots

200

Create the place value drawing for 172. 

1 Square 

7 Sticks 

2 Dots

300

Write the number in standard form: 

4 tens, 2 hundreds, 6 ones

246

400

Write this number in standard form: 

3 ones, 5 hundreds, 9 tens 

593

500

Create the place value drawing for 2,403

2 Rectangles 

4 Squares

0 Sticks 

3 Dots

Rounding

100

Round 72 to the nearest 10. 

70

200

Round 347 to the nearest 10s

350

300

Round 734 to the nearest 100s

700

400

Is 712 a reasonable answer? 

326+487=712

(Round to the nearest 10 to see if the answer is reasonable)

NO! 326 rounded to the nearest 10 is 330

      487 rounded to the nearest 10 is 490

490+330=820

712 is not close to 820; 712 is not a reasonable answer

500

Is 858 a reasonable answer? 

562+296=858

(Round to the nearest 10 to see if the answer is reasonable)

YES! 562 rounded to the nearest 10 is 560

       296 rounded to the nearest 10 is 300

560+300=860 

858 is close to 860

Adding

100

Find the sum!

342+657=______

999

200

Find the sum!

538+378=______

916

BONUS 100 POINTS TO EACH GROUP to correctly answer--round 916 to the nearest 100

300

Find the sum! 

721+65=_______

786

400

Find the sum! 

377+89

466

500

Find the sum!

1,345+68______

1413

Subtracting

100

Solve!

562-241=________

321

200

Solve!

531-180=_______

351

300

Solve!

741-556=_______

185

BONUS 100 POINTS TO EACH TEAM to correctly answer this question--round 185 to the nearest 10. 

400

Where did you have to ungroup? (1s, 10s, 100s)

837-456=________

You had to ungroup the 100s to make more 10s!

500

Where did you have to ungroup? (1s, 10s, 100s)

932-679=__________

You had to ungroup in the 10s and 100s! 

Story Problems

100

Timmy has 256 toy cars in his collection. Macy gave him 138 more. How many toy cars does Timmy have now? 

394 toy cars.

BONUS 100 POINTS TO EACH GROUP to answer this correctly--round 394 to the nearest 10. 

200

The apple orchard had 853 apples. Third graders picked 376 of them. How many apples are still at the apple orchard? 

477 apples 

300

Mary had a flock of 474 lamb. 235 were white and 119 were brown. How many black lamb did she have?

120 black lamb

400

Rachael had 736 shells. She gave 234 of them to her friend. Shortly after, she lost 156 more. How many shells does Rachael have now? 

346 shells 

500

The zoo has 242 mammals. It has 347 fish. Round each number to the nearest 10 to estimate about how many more fish the zoo has than mammals. 

The zoo has about 110 more fish. 

BONUS 100 POINTS TO EACH GROUP to correctly answer this question: what is the actual difference between the number fish and mammals?