rounding
addition and subtraction
strategies
properties of addition
FINAL JEOPARDY
100

What is 75 rounded to the nearest 10?

80

100

235 + 405 =

640

100

Which of these is a way to break apart 370 + 540?  Choose ALL the right answers.

A.  300 + 70 + 500 + 40

B.  3 + 7 + 5 + 4

C.  30 + 70 + 50 + 40

D.  370 + 30 + 510


A.  300 + 70 + 500 + 40

D.  370 + 30 + 510

100

This property says that any number plus zero equals the other number.

8 + 0 = 8

Identity Property

100
Fill in the blank.

Subtraction and addition are _____________________.

opposites

200

What is 1,546 rounded to the nearest 10?

1,550
200

What is the difference?

865 - 300 =

565

200

Find the difference using the break apart strategy.

  687 =  600 + 80 + 7

- 121 = 100 +  20 + 1

566

200

This property of addition says that you can GROUP numbers in any order and still get the same sum.

(6 + 5) + 1 = 

6  + (5 + 1) =

(6 + 1) + 5


Associative Property

200

What four math equations do you know from this fact family triangle?

3 + 4 = 7

4 + 3 = 7

7 - 3 = 4

7 - 4 = 3

300

What is 4,381 rounded to the nearest 100?

4,400

300

Which of these is NOT a strategy for addition?

using properties of addition to help

division 

number line

break apart

division

300

Use a number line to find the sum.

35 +  42 = 

77


300

This property of addition says that you can put addends in any ORDER you like and still get the same sum.

5 + 6 = 6 + 5

Commutative Property

300

Use the hat trick to solve this problem.

  900

- 311

Subtract 1 from 900.


  899

- 311

  588  +  1  = 589

400

What is 34 rounded to the nearest 100?

0

400
Coach K wants to walk 700 miles in one year.  She has walked 348 miles so far.  How many more miles does she have to walk to make her goal?


352 miles

400

Use mental math to find the difference.

80 - 20 = 

60

400

True or False?

Properties of Addition work for subtraction too.

FALSE

400

y - 301 = 400

What is the value of y?

701

500

Elaine needs to round 683 to the nearest hundred. Draw a number line that would BEST help Elaine find the answer.

500

Marvin is trying to collect 250 marbles.  His mom gave him 46 marbles for his birthday.  How many more marbles does Marvin need?

204 more marbles

500

How can you use addition to check your answer for this problem?

  791

- 134

  657

   657

+ 134

   791

500

True or False?

This is an example of the Commutative Property.

9 + 0 = 9

FALSE

500

JT has a secret number.

The number is less than 500.

When rounded to the nearest hundred, the number in the hundreds place is 4.

The number in the ones place is LESS than the number in the tens place.

What is JT's number?  

476     355    424    521

476

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