Solving Two-step Words Problems

Involving Addition And Subtraction Of

Whole Numbers Including Money

•600 - 426 = _____

•900 - 810 = _____

•2 000 - 1 593 = _____

12 - 511 +

614 - 8

18 - 916 +

913 +

4

Mang carlos picked 115 yellow mangoes and 73 green mangoes. He sold 56 mangoes in all. How

many mangoes were left to him?

4 STEPS ON PROBLEM SOLVING ACCORDING TO GEORGE POLYA

Understand

What is asked?

What are given?

Plan

What operation/s are needed to solve the problem?

What equation will solve the problem?

Solve

Look back

Does your answer make sense?

Did you label it correctly?

Understand

What is asked?

- Number of mangoes left to Mang Carlo.

What are given?

- 115 yellow mangoes, 73 green mangoes, sold 56 in all

Plan

What operation/s are needed to solve the problem?

- Addition and subtraction

What equation will solve the problem?

- 115 + 73 – 56 = n

Solve

Addition: 115

+ 73

188

Subtraction: 188

- 56

132 mangoes

Look back

Does your answer make sense?

- Yes, since 132 is less than the total.

- Yes, since 2 steps were used to find the total number of mangoes first, then the number of mangoes left.

Did you label it correctly?

- Yes

1. Mr. Javier has to deliver 760 sacks of rice. He delivered 510 to Mr. Rosales and 140 to Mr. Acosta. How many more sacks of rice will be delivered?

2. After spending 75.00 for a shirt and 125.00 for a pair of pants, Michelle had 50.00 left in her wallet. How much money did she have at first?

3. There are 246 yellow mangoes and 152 green ones. Out of these, 120 are in the basket and the rest are in the crate. How many are in the crate?

Remember:

1. Understand the problem.

- Find the hidden question.

2. Make a plan.

3. Solve/carry out the plan.

4. Look back.

Answer the following problems using polya's strategy.

1. Mr. Reyes gathered 365 mangoes on

monday and 453 on tuesday. He sold 650 mangoes on wednesday. How many mangoes were left unsold?

2. A farmer harvested 425 sacks of palay. He sold 258 sacks to buyer A and 120 to buyer B and kept the rest for his family. How many sacks of palay were left?

3. Rita bought a dress for 235.00 and pair of shoes for 574.00. She gave a 1 000-peso bill to the cashier. How much is her change?

4. Alex wants to buy a t-shirt worth 185.00 and a school bag worth 240.00. He has only 300.00. How much more money does he need?

ASSIGNMENT:

• Solve the ffollowing:

1. There are 262 boys and 528 girls in grade three. Out of these, 174 pupils are 10 years old. How many pupils are not 10 years old?

2. Piano spelled 26 words correctly on monday, 25 on wednesday and 37 on friday. If there are 100 words to be spelled, how many words did she misspell?

3. Rosalinda bought a bag for 165.00 and a pair of shoes for 395.00. How much change did she get from 1 000?