This Math quiz is called 'Number Sequences - 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.
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To begin with, let’s revisit what a sequence is. A sequence is simply a series or grouping of things arranged in a specific order. In math, a sequence is merely a series of numbers arranged in a numeric order. For example, 10, 20, 40, 80, 160, 320… is a series of numbers that go in sequential order from lowest number to highest number.
There are two different types of number sequences found in math. For this quiz we will be dealing with geometric sequences. What is a geometric sequence? A geometric sequence is a series of numbers in which each preceding term or number is multiplied by the same constant number. For example, let’s look at the following series.
1, 2, 4, 8, 16, 32, 64, 128
In this series, the constant number is “2” and each preceding number is multiplied by “2” as follows:
1 x 2 = 2
2 x 2 = 4
4 x 2 = 8
8 x 2 = 16
16 x 2 = 32
32 x 2 = 64
64 x 2 = 128
There is an easy hint that will help you find the missing constant number and that is by dividing the second number in the series by the first number. So looking at our series above you would have 2 ÷ 1 = 2. The number “2” was the constant number here.