How to find the missing part of a list - ISEE Lower Level Quantitative Reasoning

In this sequence, every subsequent number is 7 less than the preceding number. Given that the number that precedes w is 71, the value of w is . Therefore, 64 is the correct answer.

The numbers increase by 5. Given that the number before n is 20, the value of n is .

First, determine what the pattern is in the series. The pattern here is to multiply the previous number by 2 and then add 1. Therefore, multiply 47 by 2 (which is 94), and then add 1. The result is 95.

What is the next term in the following sequence?

This is an arithmetic sequence with a common difference of . To find the next term in an arithmetic sequence, add the common difference to the previously listed term:

In this sequence, the difference between each number is double the difference between the number that came prior to it in the sequence. For example, and . Thus, the missing number must be greater than by a difference of and therefore

In this sequence of numbers, there is an important pattern to recognize. Each number is greater than the number prior to it by a margin of . Thus, the correct answer is , because

In this sequence of numbers, there is an important pattern to recognize. Each number is greater than the number prior to it by a margin of 9. Thus, the correct answer is because .

In this sequence of numbers, there is an important pattern to recognize. Each number is greater than the number prior to it by a margin of . Therefore, the missing number is , because

In this sequence of numbers, there is an important pattern to recognize. Each number is greater than the number prior to it by a margin of . In other words, each number in this list is a multiple of . , , thus the next number in this sequence is the product of which equals .

In this sequence of numbers, there is an important pattern to recognize. In this sequence each number is a prime number, however the sequence skips every other prime number. Thus, the sequence begins with the prime number and then skips the prime number (which is the only even prime number) and goes to . From the next prime number is , however since the pattern in this sequence skips every other prime number--the missing number is .

In this sequence of numbers, there is an important pattern to recognize. Each number in this sequence is a composite number--however, the sequence skips every other composite number. Thus, the next composite number after is --which is skipped because of the pattern, making the correct answer .

In this sequence of numbers, there is an important pattern to recognize. Each number is greater than the number prior to it by a margin of . In other words, each number in this list is a multiple of . Thus,

In this sequence of numbers, there is an important pattern to recognize. Each number is greater than the number prior to it by double the difference between the two previous numbers. is greater than by a difference of , therefore the number that is missing must be greater than by a margin of . Thus, the correct answer is . Notice that is also less than by a difference of

In this sequence of numbers, there is an important pattern to recognize. Each number is less than the previous number by a difference that is double the margin between the previous two numbers. For example, the difference between and is And, the difference between and is . Thus, the missing number must be less than by a difference of --which means that is the missing number.

In this sequence of numbers, there is an important pattern to recognize. Each number is greater than the number prior to it by a margin of Thus,

In this sequence of numbers, there is an important pattern to recognize. Each number is less than the previous number in the sequence by a difference of . Thus, .

In this sequence, every subsequent number is less than the preceding number. Given that the number that precedes is , the value of w is . Therefore, is the correct answer.

Looking at this sequence, the most obvious thing may be the string of odd numbers. But as you look more closely, you'll notice that the 9 is missing and that there is a 2 in the list. Whenever you see a 2 in a list of odd numbers, your "prime number sensor" (not a real thing) should be on alert. As this is a list of consecutive prime numbers, the next number in the sequence is 17.

Since the pattern is adding 2, you must add 2 to 9 to get 11.

The pattern in the set is that each number increases by 6. The last number was 24. Therefore, since 6 plus 24 equals 30, would be equal to 30.