Make a table and Look for a PatternLesson 2-4

Use a Chart or Make a Table

•Sometimes putting information into a table with rows and columns makes it much easier to keep up with numbers or spot missing numbers in a problem. Sometimes you can even discover relationships and patterns among the information.

Sample Problem

•Wheels, Inc., is gearing up for its annual bicycle race. This year’s race will involve bikers from three different towns. For every eight bikers from Glendale, there will be 12 bikers from Glenbrook and nine bikers from Glenwood. If 72 bikers from Glenwood will be at the race, how many bikers from each of the other two towns will be there?

Solution

Look For a Pattern

•Looking for patterns is often useful in solving problems. Sometimes a pattern may need to be extended or the information put into a table to reveal the pattern.

Sample Problem•Detective Jones is having trouble solving

his latest case. See if you can help him crack the code to the pattern below. The solution contains at least one number and operation, and it must work for each problem.

•7 ______ = 15•23 _____ = 31•47 _____ = 55•16 _____ = ___

Solution

•7 + 8 = 15•23 + 8 = 15•47 + 8 = 55•16 + 8 = 24

Classwork• Patterns are sequences that repeat or change in an orderly

way. You can use patterns to predict the next step in solving a problem. In Crack Hacker's Safe, the player must complete a sequence of patterns to crack Hacker's safe.

Homework•P 81, 1-27 ODD