Math: Middle School: Grades 6, 7 and 8 Quiz - Number Sequences - Mixing Arithmetic and Geometric Sequences (Questions)

This Math quiz is called 'Number Sequences - Mixing Arithmetic and Geometric Sequences' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.

It costs only $12.50 per month to play this quiz and over 3,500 others that help you with your school work. You can subscribe on the page at Join Us

By now you should understand that a sequence is a series or grouping of things arranged in a specific order and in math, it refers to a series of arranged numbers. There are two sequences – the arithmetic sequence and the geometric sequence.

[readmore]

In the arithmetic sequence there exists a constant number that is either added to or subtracted from each number in the series. In the geometric sequence, you have a constant number that is multiplied to each of the numbers in the series.

In order to do this quiz, please first check out the quizzes on Arithmetic Sequence and Geometric Sequence. These quizzes will help you to understand the process of determining the sequence.

Doing number sequences is not hard but it does take some concentration to first determine the constant number and then to remember which sequence you are working with.

[/readmore]
1. Which series of numbers below is NOT a geometric sequence?
[ ] 17, 289, 4,913, 83,521, 1,419,857
[ ] 20, 30, 40, 50, 60, 70
[ ] 13, 26, 52, 104, 208, 416
[ ] 7, 28, 112, 448, 1,792, 7,168
2. Which series of numbers below is NOT an arithmetic sequence?
[ ] 10, 60, 360, 2,160, 12,960, 77,760
[ ] 5, 10, 15, 20, 25, 30, 35, 40
[ ] 12, 20, 28, 36, 44, 52, 60, 68
[ ] 1, 51, 101, 151, 201, 251, 301
3. In the following geometric sequence, which number is missing from the series?
(2, 18, 162, 1,458, _____, 118,098)
[ ] 13,022
[ ] 13,102
[ ] 13,112
[ ] 13,122
4. In the following arithmetic sequence, which number is missing from the series?
(78, 83, 88, 93, _____, 103, 108)
[ ] 96
[ ] 97
[ ] 98
[ ] 99
5. In the following geometric sequence, determine what the constant number is.
(15, 45, 135, 405, 1,215)
[ ] 3
[ ] 4
[ ] 5
[ ] 6
6. In the following arithmetic sequence, determine what the constant number is.
(22, 40, 58, 76, 94, 112)
[ ] 16
[ ] 18
[ ] 14
[ ] 12
7. Which series of numbers below is a geometric sequence?
[ ] 3, 21, 147, 1,028, 6,174
[ ] 8, 16, 24, 32, 40, 48, 54
[ ] 2, 22, 242, 2,662, 29,282
[ ] 12, 24, 48, 68, 74, 98, 104
8. Which series of numbers below is a geometric sequence?
[ ] 10, 20, 30, 35, 45, 50, 60
[ ] 14, 15, 16, 17, 18, 19, 21, 22, 24, 25, 26
[ ] -24, -16, -8, 0, 8, 16, 24
[ ] 48, 41, 34, 27, 21, 14, 7, 1
9. Which series of numbers below is NOT a geometric sequence?
[ ] 13, 26, 39, 52, 65, 78, 91
[ ] 13, 26, 52, 104, 208, 416
[ ] 13, 39, 117, 351, 1,053, 3,159
[ ] 13, 52, 208, 832, 3,328, 13,312
10. In the following arithmetic sequence, which number is missing from the series?
(64, 52, 40, 28, __, 4)
[ ] 14
[ ] 16
[ ] 17
[ ] 18
Math: Middle School: Grades 6, 7 and 8 Quiz - Number Sequences - Mixing Arithmetic and Geometric Sequences (Answers)
1. Which series of numbers below is NOT a geometric sequence?
[ ] 17, 289, 4,913, 83,521, 1,419,857
[x] 20, 30, 40, 50, 60, 70
[ ] 13, 26, 52, 104, 208, 416
[ ] 7, 28, 112, 448, 1,792, 7,168
Answer (a) can be figured by dividing the second number by the first number so 289 ÷ 17 = 17 and the constant number is used throughout the series so this is a geometric sequence. Answer (c) can be figured by multiplying by the constant number “2” making this a geometric sequence. Answer (d) can be figured by multiplying by the constant number “4” to each proceeding number making this a geometric sequence. However, with Answer (b), it appears that the constant number “10” is being added to each preceding number making this an arithmetic sequence and NOT a geometric sequence. Answer (b) is the correct answer
2. Which series of numbers below is NOT an arithmetic sequence?
[x] 10, 60, 360, 2,160, 12,960, 77,760
[ ] 5, 10, 15, 20, 25, 30, 35, 40
[ ] 12, 20, 28, 36, 44, 52, 60, 68
[ ] 1, 51, 101, 151, 201, 251, 301
Answer (b) is figured by adding the constant number “5” to each preceding number making this an arithmetic sequence. Answer (c) is figured by adding the constant number “8” to the preceding number making this an arithmetic sequence. Answer (d) is figured by adding the constant number “50” to each preceding number making this an arithmetic sequence. Answer (a) on the other hand is figured by multiplying by the number “6” to each preceding number and continues throughout the series of numbers making it a geometric sequence. Answer (a) is the correct answer
3. In the following geometric sequence, which number is missing from the series?
(2, 18, 162, 1,458, _____, 118,098)
[ ] 13,022
[ ] 13,102
[ ] 13,112
[x] 13,122
A quick way to find the constant number in this series is to divide the second number by the first number so 18 ÷ 2 = 9. Now let’s multiply 18 x 9 = 162. Yes, it appears that the common factor is the number “9”. So multiply 1,458 x 9 = 13,122. This tells us that Answer (d) is the correct answer
4. In the following arithmetic sequence, which number is missing from the series?
(78, 83, 88, 93, _____, 103, 108)
[ ] 96
[ ] 97
[x] 98
[ ] 99
A quick way to find the constant number in this series is to subtract the first number from the second number so 83 - 78 = 5. Now let’s see what happens if we add 5 to 83. 83 + 5 = 88. Yes, it appears that the common factor is the number “5”. So let’s now add 5 to 93. 93 + 5 = 98. Answer (c) is the correct answer
5. In the following geometric sequence, determine what the constant number is.
(15, 45, 135, 405, 1,215)
[x] 3
[ ] 4
[ ] 5
[ ] 6
A quick way to find the constant number in this series is to divide the second number by the first number so 45 ÷ 15 = 3. Now let’s multiply 45 x 3 = 135. Yes, it appears that the common factor is the number “3” and it is being multiplied to the preceding number. Answer (a) is the correct answer
6. In the following arithmetic sequence, determine what the constant number is.
(22, 40, 58, 76, 94, 112)
[ ] 16
[x] 18
[ ] 14
[ ] 12
A quick way to find the constant number in this series is to subtract the first number from the second number so 40 - 22 = 18. Now add 18 to 40 so 40 + 18 = 58. Yes, it appears that the common factor is the number “18”. Answer (b) is the correct answer
7. Which series of numbers below is a geometric sequence?
[ ] 3, 21, 147, 1,028, 6,174
[ ] 8, 16, 24, 32, 40, 48, 54
[x] 2, 22, 242, 2,662, 29,282
[ ] 12, 24, 48, 68, 74, 98, 104
Answer (a) is figured by multiplying the number “7” but then it breaks at the number 147 so it is not a true sequence. Answer (b) is figured by adding the number “8” making it an arithmetic sequence. Answer (d) does not contain a constant number and is, therefore, not a true sequence. Answer (c) on the other hand is figured by multiplying the number “11” to each preceding number and continues throughout the series of numbers making it a geometric sequence. Answer (c) is the correct answer
8. Which series of numbers below is a geometric sequence?
[ ] 10, 20, 30, 35, 45, 50, 60
[ ] 14, 15, 16, 17, 18, 19, 21, 22, 24, 25, 26
[ ] -24, -16, -8, 0, 8, 16, 24
[x] 48, 41, 34, 27, 21, 14, 7, 1
Answer (a) is figured by adding the number “10” but then it breaks at the number 30. Answer (b) is figured by adding the number “1” but then it breaks at the number 19. Answer (d) is figured by subtracting the number “7” but then it breaks at the number 27. Because of the break in adding or subtracting each preceding number by a constant number the series ends causing none of these answers to be correct. Answer (c) on the other hand is figured by adding the number “8” to each preceding number and continues throughout the series of numbers making it a geometric sequence. Answer (c) is the correct answer
9. Which series of numbers below is NOT a geometric sequence?
[x] 13, 26, 39, 52, 65, 78, 91
[ ] 13, 26, 52, 104, 208, 416
[ ] 13, 39, 117, 351, 1,053, 3,159
[ ] 13, 52, 208, 832, 3,328, 13,312
Answer (b) can be figured by multiplying each preceding number by the constant number “2” so it is a geometric sequence. Answer (c) can be figured by multiplying by the constant number “3” so it is a geometric sequence. Answer (d) can be figured by multiplying each preceding number by the constant number 4 also making it a geometric sequence. However, Answer (a) can be figured by adding the constant number 13 to each preceding number making it an arithmetic sequence and NOT a geometric sequence. Answer (a) is the correct answer
10. In the following arithmetic sequence, which number is missing from the series?
(64, 52, 40, 28, __, 4)
[ ] 14
[x] 16
[ ] 17
[ ] 18
A quick way to find the constant number in this series is to subtract the first number from the second number so 64 - 52 = 12. Now let’s see what happens if we subtract 12 from 52 so 52 - 12 = 40. Yes, it appears that the common factor is the number “12” and it is being subtracted from the preceding number. So let’s now subtract 12 from 28. 28 - 12 = 16. Answer (b) is the correct answer