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Sequences and Series Videos 12 videos
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Intermediate Algebra Drill 3, Problem 2. Find the sixth number in the series.
ACT Math: Pre-Algebra Drill 4, Problem 2. What is the fourth term in the series?
SAT Math 3.1 Numbers and Operations 198 Views
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Description:
SAT Math 3.1 Numbers and Operations
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by Missing Terms.
- 00:06
There’s a reward being offered for their return; unfortunately, the amount is an irrational number.
- 00:12
Find the missing term in the sequence: 5, 2.5, 1.25, blank and 0.3125.
- 00:19
And here are the potential answers...
- 00:22
The question is asking us to divine a number in a sequence... which means there's a pattern here.
Full Transcript
- 00:28
Yeah, kinda like this. But with numbers.
- 00:30
Let's take a look at each term and compare one term to another to find the pattern.
- 00:34
To get from Term 1 to Term 2, or from 5 to 2.5, we divide T1 by 2.
- 00:42
To get from Term 2 to Term 3, we divide 2.5 by 2 to get 1.25.
- 00:48
The pattern is to divide each term by 2 to get the next successive term.
- 00:51
So… to get from Term 3 to Term 4, the unknown term we're looking for, all we need to do
- 00:56
is divide again: 1.25 divided by 2 = 0.625. Boom.
- 01:03
Looks like our answer is (A)! And…we’re done!
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