Properties of Numbers and Operations

There are 10 people in a group who play guitar and 13 people who play the saxophone. These are the only people in this group. What is the minimal number of people in this group?

• 10

• 13

• 23

What property is this?

174+(30+5)=(174+30)+5

• Identity

• Closure

• Associative

What is the unique identity for addition?

• 0

• 1

• 10

• 2

Use the number line on the left to solve 10-7=__?

• 1

• 2

• 3

• 0

There are 18 people who love to read and 2 people who love movies. These are the only people in this group. What is the maximum number of people in this group?

• 0

• 20

• 2

Round 6,900,894 to the nearest hundred.

• 6,900,800

• 6,900,880

• 7,900,000

• 6,900,900

Subtraction is communicative?

For example: 10-3=3-10

• True

• False

• Neither

• IDK

Fill in the blank
___ + 5 = 5 + 9

• 9
• 19
• 14
• -9

Tags

CCSS.3.NBT.A.2

Use front end estimation to find the sum

419 + 156 + 294

• 700

• 869

• 800

Is a set of even numbers closed for addition?

• Yes

• No