Bridges In Mathematics Grade 4 Unit 6 Answer Key
T4
© The Math Learning Center | mathlearningcenter.org Bridges in Mathematics Grade 5 Teacher Masters
Session 3
class set, plus 1 copy for display
Unit 1 Pre-Assessment
page 1 of 3
1
Evaluate (solve) each expression below.
a
(9 × 2) × 5 =
b
5 × (13 × 2) =
c
50 × 64 − (1 × 64) =
d
2 × (6 × 4) + 2 × (3 × 4) + 2 × (6 × 3) =
2
Fill in the blanks to make each set o equations true.
a
(99 × 497) + (1 × 497) = _____ × 497 = _____
b
98 × 36 = (_____ × 36) − (2 × 36) = _____
3
Fill in the missing number in the equation below. Ten, describe how you can use number relationships to fill in the blank without having to find the answer to 16 × 14. _____ × 28 = 16 × 14
4
Write
true
or
false
next to each equation. Ten, describe below each one how you can use number relationships to tell whether the equation is true or alse without having to find the answer on both sides.
a
18 × 120 = 9 × 240 _____
b
(3 × 4) × 6 = 3 × (4 × 6) _____
c
58 × 17 = (60 × 17) + (2 × 17) _____
5
Write a numerical expression to represent each statement below. Include any grouping symbols (such as parentheses) you need to make the expression as clear as possible.
a
o find 15 × 18, I double and halve.
b
o find 9 × 26, I find 10 times 26 and subtract 1 group o 26.
c
How can I find the volume o a box that has a 18-by-21 base and 37 layers?
Answer Key
90 8 T F T
Explanations will vary. Example:
You can use doubling and halving. 28 is double 14, so just cut 16 in half, and the two sides of the equation will be equal.
Explanations will vary. Examples shown.
Expressions will vary.
100 100 3,136
30 × 9 (10 × 26) – (1 × 26) 18 × 21 × 37 or (18 × 20 × 37) + (18 × 1 × 37)
3,528 130 108
A doubling and halving strategy shows this equation to be true. When you multiply, you can use the numbers in any order and the answer will be the same. This equation can
'
t be true because 60 + 2 is not the same as 58.
49,700
Unit 1 Module 1
NAME | DATE
(continued on next page)
© The Math Learning Center | mathlearningcenter.org
6
Bridges in Mathematics Grade 5 Assessment Guide
T5
© The Math Learning Center | mathlearningcenter.org Bridges in Mathematics Grade 5 Teacher Masters
6
Write and solve an equation to represent each statement below.
a
o find 15 times 32, I multiply 10 times 32 and add it to 5 times 32.
b
o find 42 times 25, I double and halve.
7
How many 1 × 1 × 1 cubes are in the rectangular prisms shown below? Write and solve equations to show.
a
Equation or number o cubes: ______________________________________
6 5 2
b
Equation or number o cubes: ______________________________________
8
Brad counted the number o balls in one layer o a box, and ound out there were 24. Te box has 9 layers. How many balls can the box hold in all? Show your work.
Session 3
class set, plus 1 copy for display
Unit 1 Pre-Assessment
page 2 of 3
Answer Key
(10 × 32) + (5 × 32) = 320 + 160 = 480 (4 × 3) × 7 = 84 (2 × 6) × 5 = 60 42 × 25 = 21 × 50 = (20 × 50) + (1 × 50) = 1,050 Equations will vary. Example: (2 × 6) × 5 = 2 × (6 × 5) = 2 × 30 = 60 There are 60 cubes. Work and equations will vary. Example: 24 × 9 = (20 × 9) + (4 × 9) = 180 + 36 = 216 There are 216 balls. Equations will vary. Example: (4 × 3) × 7 = 4 × (3 × 7) = 4 × 21 = 84 There are 84 cubes.
Equations will vary. Examples shown.
Unit 1 Module 1
NAME | DATE
(continued on next page)
7
© The Math Learning Center | mathlearningcenter.org Bridges in Mathematics Grade 5 Assessment Guide
Bridges In Mathematics Grade 4 Unit 6 Answer Key
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