6th Grade Math Textbook, Progress

30

Strategy: Use a Graph

The science class plants 40 seeds. The students

can display the number of seeds that sprout each

day on a graph. How many seeds have not

sprouted by May 10?

This problem has a hidden question.

How many seeds have already sprouted?

total number 
 number of seeds  number of seeds

of seeds planted sprouted not sprouted

40 


So to find the number of seeds that have not

sprouted by May 10, you must:

• First, use the data from the graph and add to find
  the number of seeds sprouted up to May 10.


• Then subtract your answer in Step 1 from 40.

Visualize yourself in the problem above as

you reread it. List the facts and the question.

Does 2  0  2  3  5  7  8  6  7 40? Ye s.

First add. (Hint:Look for tens.)

2  0  2  3  5  7  8  6  33

Then subtract: 40
 33  7 seeds not sprouted.

Seven seeds have not sprouted by May 10.

0

2

4

6

8

10

2

Number of Seeds Sprouted

Date in May

4 6 8 10 12

Seed Data

??

Facts: total number of seeds— 40

number of seeds sprouted each day —

data given on the line graph

Question: How many seeds have

not sprouted by May 10?

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