Unit 6 Review

Here is a number rack with 20 beads, but some of them are hidden behind a screen. Fill in the missing number to complete the equation.

16 + ? = 20

Here is a number rack with 20 beads, but some of them are hidden behind a screen. Fill in the missing number to complete the equation.

13 + ? = 20

Here is a number rack with 20 beads, but some of them are hidden behind a screen. Fill in the missing number to complete the equation.

19 + ? = 20

10 + 8 = ?

• 18

• 20

• 19

• 17

6 + 4 = ?

• 8

• 14

• 10

• 11

10 + 2 = ?

• 14

• 10

• 9

• 12

4 + 4 = ?

• 10

• 8

• 12

• 9

17 + 3 = 20

True or False?

• True

• False

20 - 6 = 12

True or False?

• True

• False

3 + 7 = 6 + 5

• True

• False