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MTH00IIB |Math Foundations II | Unit 5 Answer Key| Expressions and Equations
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Date:
Answer Key
Unit 5 Assignment
Award points for answers as shown below. Starter feedback for correct and incorrect answers is in red. Use or adapt
the feedback in this Answer Key as you grade each student paper. If you have suggestions for improving this key, send
them to [email protected].
Solve the following problems:
(1 point)
1. Write three million four hundred thousand in standard form.
Answer: 3,400,000
(1 point)
2. Write 4000 + 600 + 8 in standard form.
Answer: 4608
(1 point)
3. Write 5  3  2 in standard form.
Answer: 30
(1 point)
4. Write 3  53 in standard form.
Answer: 375
(1 point)
5. Write fourteen million seven thousand two in standard form.
Answer: 14,007,002
(1 point)
6. Write 70,000 + 2,000 + 700 + 30 + 9 in standard from.
Answer: 72,739
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Page 1 of 7
MTH00IIB |Math Foundations II | Unit 5 Answer Key| Expressions and Equations
(1 point)
7. If a = 4, b = 3, and c = 2 then what does (a + b)c equal?
Answer: 14
(1 point)
8. If a = 4, b = 3, and c = 2 then abc equals ________.
Answer: 24
(1 point)
9. If a = 4, b = 3, and c = 2 then
ac
equals ________.
b
Answer: 2
(1 point)
10. Write an algebraic expression for a number n increased by a number m.
Answer: n + m
(1 point)
11. Write an algebraic expression for 12 decreased by z.
Answer: 12 – z
(1 point)
12. Write an algebraic expression for a number k minus 8.
Answer: k – 8
(1 point)
13. A person can find the approximate number of pints of blood in his or her body by dividing his or her
weight by 16. Write an algebraic expression to describe this relationship.
w
Answer: w/16 or 16
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Page 2 of 7
MTH00IIB |Math Foundations II | Unit 5 Answer Key| Expressions and Equations
(1 point)
14. Which property is illustrated by (3 +4) + 6 = 3 + (4 + 6)?
identity
distributive
associative
commutative
Answer: associative
(1 point)
15. Which property is illustrated by 12  x  3  3  12  x ?
identity
distributive
associative
commutative
Answer: commutative
(1 point)
16. What property is illustrated by 6  1  6 ?
identity
distributive
associative
commutative
Answer: identity
(1 point)
17. What property is illustrated by 65(32  45)  (65 32) (65 45) ?
identity
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Page 3 of 7
MTH00IIB |Math Foundations II | Unit 5 Answer Key| Expressions and Equations
distributive
associative
commutative
Answer: distributive
(1 point)
18. True or false, the commutative property basically states that numbers can be added or subtracted in any
order.
Answer: false
(1 point)
19. True or false, the sum of zero and an addend is zero.
Answer: false
(1 point)
20. What property is illustrated by 7  0  0 ?
Answer: zero property of multiplication
(1 point)
21. Which property is illustrated by 8  0  8 ?
Answer: identity property of addition or zero property of addition
(1 point)
22. 21  2  3  4 =
Answer: 11
(1 point)
23. (34  3)  24  6 
Answer: 84
(1 point)
24. 2(5 + 4) − 3(7) =
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Page 4 of 7
MTH00IIB |Math Foundations II | Unit 5 Answer Key| Expressions and Equations
Answer: -3
(1 point)
25.
27  7
=
40  35
Answer: 4
(1 point)
26. 36  9  3 =
Answer: 12
(1 point)
27. True or false, 2(38−12) = 49
Answer: false
(1 point)
28. 6[4  (12  3)  3] =
Answer: 42
(1 point)
29. 500 + n = 800
n = ________
Answer: 300
(1 point)
30. 56 = x – 7
x = ________
Answer: 63
(1 point)
31. 17 + n = 14 + 3 n= ________
Answer: 0
(1 point)
32. 42 − 5 = x
x = ________
Answer: 37
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Page 5 of 7
MTH00IIB |Math Foundations II | Unit 5 Answer Key| Expressions and Equations
(1 point)
33. 4 + 18 + c = 25
c = ________
Answer: 3
(1 point)
34. c + 36 = 20 + 21
c = ________
Answer: 5
(1 point)
35. 327 + n = 742
n = ________
Answer: 415
(1 point)
36. 9m = 81
m = ________
Answer: 9
(1 point)
37. 75 = 3n
n = ________
Answer: 25
(1 point)
38. r  7  12
r = ________
Answer: 84
(1 point)
39. 7  3  y
7
Answer: 3
y = ________
1
or 2 3 or 2.3
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Page 6 of 7
MTH00IIB |Math Foundations II | Unit 5 Answer Key| Expressions and Equations
(1 point)
40.
13
y
5
y = ________
3
Answer: 25 or 2.6
Your Score
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___ of 40
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