Unit 9 Contents

Check-In: Questions 8–9

8. Is each number sentence true? If it is not true, add parentheses to make it true.
1. 4 + 3 − 2 1 = 5
2. 4 + 2 ÷ 3 1 = 2
3. 4 3 2 + 1 = 25
4. 4 + 1³ + 2 = 127
9. Complete the following number sentences by writing a single number after the equal sign.
1. 8 + 2 6 + 3 =
2. 8 + 2 (6 + 3) =
3. (5 + 4) 3² =
4. 5 + 4 3² =

1. Complete the following number sentences by writing a single number after the equal sign.
1. 9 + 27 ÷ 9 − 3 =
2. (9 + 27) ÷ 9 − 3 =
3. 100 + 7 10 − 1 =
4. (100 + 7) 10 − 1 =
5. (5 + 4 + 3)² + 1 =
6. 5 + 4 + 3² + 1 =
2. Use the digits 1, 2, 3, and 4 to write number sentences for the whole numbers below. Remember to follow the order of operations. Try to use exponents.
1. 12
2. 17
3. 63
4. 50