Problem Solving
Can you problem solve using what you have learned about related facts?
Goal:
Goal:
Practice!
Goal: Apply what you have learned about unknown numbers to solve a word problem.
It is time to get your paper and pencil out! Read this division word problem and click through the slides to find the unknown number.
Write this word problem on your paper:
What division fact is this word problem asking you to solve? Write it on your paper. Then, check your work by clicking the Show Me button below.
We do not know the dividend, so the division equation is ? \({ \div }\) 6 = 9.
What related multiplication fact will help you find the missing number? Write it on your paper, then click the Show Me button to check your answer.
The divisor and quotient become factors in the related multiplication fact.
It is time to find the unknown number! How will you solve the related multiplication fact? Use one of the strategies below to multiply:
- Repeated Addition
- Skip-counting
- Number Line
- Array
- Picture
- Multiplication Table
Once you have used one of these strategies, click through the slides to check your work.
Repeated Addition
Did you use repeated addition? Your addition sentence should look like this:
Skip-counting
Did you use skip-counting? The skip-counting sequence should look like this:
Number Line
Did you draw a number line? Your number line should look like this:
Array
Did you draw an array? It should look something like this:
Picture
Did you draw a picture? It should look something like this:
Multiplication Table
Did you create a multiplication table? It should look something like this:
Great job! The product is 54. That means the unknown number is also 54.
The farmer started with 54 bags of chicken feed.
Which division strategy helps you find the unknown number?
Dennis picked 90 apples from 10 different apple trees. How many apples did he pick from each tree?
90 \({ \div }\) ? = 10
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\({90 – 10 – 10 – 10 – 10 – 10 – 10 – 10 = 0}\)
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Look for the strategy that shows 90 divided into 10 equal groups.
Look for the strategy that shows 90 divided into 10 equal groups.
The picture shows 9 equal groups of 10. This proves 90 \({ \div }\) 10 = 9.
Summary
Questions answered correctly:
Questions answered incorrectly: