Bridges UNIT 1 STUDY GUIDE

Evaluate each expression below. a) (9 x 2) x 5 = _______

• 90

• 45

• 100

• 80

Evaluate each expression below. b) 5 x (13 x 2) = _______

• 130

• 120

• 150

• 100

Evaluate each expression below. c) (50 x 64) - (1 x 64) = _______

• 3136

• 3200

• 3072

• 2560

Evaluate each expression below. d) 2 x (6 x 4) + 2 x (3 x 4) + 2 x (6 x 3) = _______

• 120

• 96

• 108

• 144

Fill in the missing number in the equation below. ______ x 28 = 16 x 14

• 8

• 6

• 10

• 12

You can use number relationships to fill in the blank without having to find the answer to 16 x 14 first. What strategy can you use?

• Break apart one of the numbers and use the distributive property

• Guess the answer and check if it fits

• Multiply the numbers in any order without breaking them apart

• Add the two numbers together instead of multiplying

Write a numerical expression to represent this statement: To find 36 x 9, I find 36 times 10 and remove one group of 36. Do not solve.

• (36 x 10) - 36

• (36 x 10) + 36

• (36 x 9) - 10

• (36 x 9) + 36

Write a numerical expression to represent this statement: To find the volume of a box that has a 15-unit by 24-unit base and 32 layers, I multiply the dimensions of the base first and then multiply by the number of layers. Do not solve.

• (15 x 24) x 32

• 15 + 24 + 32

• (15 x 32) x 24

• 15 x (24 + 32)

Write and solve an equation to represent this statement: To find 25 x 16, I double and halve.

• 25 x 16 = 50 x 8 = 400

• 25 x 16 = 12.5 x 32 = 400

• 25 x 16 = 25 x 8 = 200

• 25 x 16 = 50 x 16 = 800

Find the volume of each rectangular prism. Write and solve equations to show your thinking. Be sure to label the units.

• Equation: 3 x 3 x 5 = 45 cubic units

• Equation: 3 x 3 x 3 = 27 cubic units

• Equation: 3 x 5 x 5 = 75 cubic units

• Equation: 3 x 5 x 2 = 30 cubic units