Problem Solving

Try, Check, and Revise

Question.
How many posters did Shana make?

Guided Practice

Do you know HOW?
Question 1.
Peg and Pat are sharing 64 crayons. Pat has 10 more crayons than Peg. How many crayons does each girl have?

Do you UNDERSTAND?
Question 2.
Look at the diagram for Problem 1. Why aren’t Peg’s part and Pat’s part of the rectangle the same size?

Question 3.
Write a Problem Write a problem that can be solved by using reasoning to make good tries.

Independent Practice

Question 4.
All together, Rod has 38 crayons, markers, and pencils. He has 5 more crayons than markers. He has the same number of markers and pencils. How many markers does he have?

Plan
Use reasoning to make good tries.
Then check.
Try: 10 + 10 + 13 = 33
Check: 33 < 36
Too low, I need 3 more.
Try: 12 + 12 + 15 = 39
Check: 39 > 36
Too high, I need 3 less.

Solve
Revise, using what you know.
Try: 11 + 11 + 14 = 36
Check: 36 = 36
This is correct.

Use the pictures at the right for 5 and 6.

Question 5.
The clerk at the flower store puts all the roses into two vases. One vase has 2 more roses than the other vase. How many roses are in each vase?

Question 6.
Edna, Jay, and Bob bought all of the carnations in the flower store. Edna bought 2 more than Jay. Bob and Jay bought the same number. How many carnations did Edna buy?

Question 7.
Mr. Tyler bought one iris for $1.25 and 3 roses for$3 each. How much did Mr. Tyler spend for the roses?

Question 8.
Cam bought an iris for \$1.25. He paid with 6 coins. What coins did he use?