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# Numbers and Operations Practice Problems: GED Math

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Updated on Mar 23, 2011

Review these concepts if necessary:

### Problems

1. 10 – 5 + 2 =
1. 3
2. –3
3. –7
4. 7
5. 10
2. 32 – 40 ÷ 4 =
1. –2
2. –18
3. 22
4. 12
5. 42
3. Estimate the answer to the nearest 10: 7 + (4 + 52) × (4 + 3) =
1. 70
2. 390
3. 400
4. 440
5. 2,740
4. Which choice shows the prime factorization of 60?
1. 3 × 4 × 5
2. 6 × 10
3. 6 × (8 + 2)
4. 1 × 60
5. 2 × 2 × 3 × 5
5. Find the greatest common factor of 20 and 30.
1. 60
2. 20
3. 5
4. 600
5. 10
6. Find the least common multiple of 40 and 50.
1. 10
2. 5
3. 100
4. 200
5. 2,000
7. Which choice shows an example of the distributive property?
1. 7 × (8 × 6) = (7 × 8) × 6
2. 7(40 + 8) = 7 × 40 + 7 × 8
3. 7 × 48 = 48 × 7
4. 7(40 + 8) = 7 × 20 + 7 × 28
5. 7 × 40 + 8 = 7 × (40 + 8)
8. 100 ÷ 5 + |–5 × 3| =
1. 35
2. 75
3. 5
4. 45
5. 33
9. Which choice shows an example of the associative property?
1. 12 + (49 + 51) = (49 + 51) + 12
2. 49 + (51 + 12) = (49 + 51) + 12
3. 49 + (51 + 12) = 49 + 51 + (49 + 12)
4. 12 + 49 + 51 = 51 + 49 + 12
5. 12(49 + 51) = 12 × 49 + 12 × 51
10. Which example shows the commutative property?
1. 29 × 7 × 21 = (29 × 7) × 7 × 21
2. (29 × 7) × 21 = 29 × (7 × 21)
3. 29 × 7 × 21 = 29 × 21 × 7
4. 29 × 7 × 21 = 203 × 21
5. 29(7 + 21) = 29 × 7 + 29 × 21
11. Which of the following will result in an even-number answer?
1. 3 × 7
2. 2 + 3
3. 5 × 9
4. 7 + 5
5. 1 × 7
12. |3 × –7| =
1. –21
2. –4
3. 4
4. 10
5. 21
1. 25 + 15 × 3 =
1. 120
2. 30
3. 15
4. 70
5. 13
2. 8 – 10 ÷ 2 =
1. –1
2. 1
3. 3
4. –3
5. 9
3. 5 × (6 + 19) =
1. 49
2. 125
3. 115
4. 5
5. –5
4. 12 + 144 ÷ (8 + 4) =
1. 24
2. 16
3. 144
4. 32
5. 34
5. 120 ÷ 5 × –2 =
1. 12
2. –50
3. –48
4. 48
5. 50
6. Which example shows the prime factorization of 90?
1. 9 × 10
2. 90 × 1
3. 2 × 3 × 3 × 5
4. 2 × 5 × 9
5. 3 × 3 × 10
7. Which choice shows an example of the distributive property?
1. 5 × 27 = 27 × 5
2. 5(20 + 7) = 5 × 20 + 5 × 7
3. 5 × (9 × 3) = (5 × 9) × 3
4. 5(20 + 7) = 2 × 15 + 5 × 7
5. 5 × 20 + 7 = 5 × (20 + 7)
8. What is the greatest common factor of 48 and 120?
1. 12
2. 2
3. 240
4. 3
5. 24
9. What is the least common multiple of 20 and 30?
1. 20
2. 30
3. 600
4. 60
5. 10
10. Estimate the answer to the nearest ten: 35 – 5 + 7 =
1. 20
2. 30
3. 35
4. 40
5. 50
11. Which of the following will result in an odd-number answer?
1. 36 + 48
2. 20 × 8
3. 37 + 47
4. 7 × 12
5. 13 + 12
12. –25 ÷ |9 – 4| =
1. –30
2. –20
3. –5
4. 5
5. 13
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