3rd Grade Math Chapter 1 (1-5)

Number Patterns

100

What is the sum of 3 + 8? Is it even or odd?

11 

11 is odd.

200

What related number sentence shows the Commutative Property of Addition?

3 + 9 = 12

9 + 3 = 12

300

What is the sum of 10 + 4 ? Is it even or odd?

14

14 is even.

400

Find the sum of 15 + 0. Write the name of the property that you used to find the sum.

15

Identity Property of Addition

500

Which number sentences show the Commutative Property of Addition? Mark all that apply.

a) 27 + 4 = 4 + 27     c) 27 + (4 + 0) = (27 + 4) + 0

b) 27 + 4 = 31           d) 27 + 0 = 0 + 27

a & d

Rounding to the nearest Ten or Hundred

100

What are two signal words that let you know we have to round? 

about how many

estimate

200

Round 174 to the nearest hundred.

Use a number line to show your work

200

300

Round 44 to the nearest Ten. Show your work using a number line.

40

400

Stretch your thinking:

Write a number that is the same when rounded to the nearest hundred and ten. Explain your answer.

example of possible answer could be:

203

203 rounded to the nearest hundred is 200 and 203 rounded to the nearest ten is also 200.

500

Using a number line round the number 718 to the nearest ten. 

718 rounded to the nearest ten is 720.

Estimate Sums

100

What does the word estimate mean?

a number close to an exact amount.

200

Use rounding to add 304 + 494

300 + 500 = 800

300

Use rounding to add 19 + 54

20 + 50 = 70

400

Round and add up the addends to solve: 478 + 213

500 + 200 = 700

500

round and add to find the sum: 255 + 342

300 + 300 = 600

Mental Math Strategies for Addition

100

Count by tens and ones to find 63 + 27. Using a number line to show the jumps. 

63 + 27 = 90

200

Count by tens and ones to find 54 + 26. Draw the jumps on the number line to show your work.

54 + 26 = 80

300

What is an addend?

A number which is being added to another number.

6 + 3 = 9

6 and 3 are addends

400

what is a sum

the answer after adding addends together.

5 + 2 = 7 

7 is the sum.

500

Count by tens and ones to find 38 + 22

38 + 22 = 60

Properties of Addition

100

What is the Associative Property of Addition?

group the addends in different ways and still get the same sum.

200

Find the sum of 46 + 55 + 24 using the Associative Property of Addition

 

group together two numbers example 46 + 24 = 70 and then 55 + 70 = 125

300

What is the Commutative Property of Addition?

you can add two or more numbers in any order and get the same sum

400

Using the Commutative Property of Addition solve:

43 + 39 + 43 + 11

43 + 43 + 39 + 11 = 136

500

Select the number sentences that show the Associative Property of Addition.

a) (86 + 7) + 93 = 86 + (7 + 93)

b) 86 + 0 = 86

c) (70 + 2) + 72 = 72 + (2 + 70)

d) 55 + 5 = 5 + 55

 a & c