### It’s As Easy As 1, 2, 4, 7, …

Remember all of the basic math we started this course with? What was the most important math skill? You got it, Signed Numbers.

If you started working on the takehome problems, you know that there are several formats used to calculate a Signed Number problem:

- Calculator operations
- Word Problems
- Double signs

Although you won’t see any of these kinds of problems on the actual ETAA, the above math skills are necessary to answer each ETAA question. Here’s the page in the manual to help memorize the rules for ASMD of Signed Numbers:

For example:

What is the opposite of eight-nine less than the opposite of seventy?

Today, we will review the following types of Numeric Sequences:

- First Order
- Second Order

Many test prep pages on Numeric Sequences include the following, but are NOT on the ETAA

- Alternating Sequences
- Geometric Sequences

If you can answer 2^{nd} Order Sequences, you can be confident you will get all 4 of these question right on the test.

Ex: -43, -25, -10, ???, 11, 17, 20

Consider the following 2nd Order Sequence: -43, -25, -10, ???, 11, 17, 20

In the day class, an excellent question: “How to speed up getting the answer?”

You don’t need to find all of the blue -4s. Look at the green piece on the left. Once you find one of the -4s (and you’re confident with your math skills), then just do -35 + 10 – 4 = -29. Answer. Or work it backwards with the green piece on the right — what number +2 gives you -27? -29.

All you need is the green part on the left, OR the green part on the right to find the answer. You don’t have to figure out the entire series.