Relate multiplication and division and understand that division can represent situations of unknown group size or an unknown number of groups.
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Presley has 10 markers. Her teacher gives her 2 boxes and asks her to put an equal number of markers in each box.
Anthony has 10 markers. His teacher wants him to put 2 markers in each box until he is out of markers.
a. Before you figure out what the students should do, write a multiplication sentence to correspond with each context above.
b. Solve each problem for the missing factor.
Markers in Boxes, accessed on Oct. 10, 2018, 2:32 p.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.
Modified by The Match Foundation, Inc.Suppose that there are 4 tanks and 3 fish in each tank, as shown in the picture below. The total number of fish in this situation can be expressed as 4 x 3 = 12.
a. Describe what is meant in this situation by 12 $$\div$$ 3 = 4.
b. Describe what is meant in this situation by 12 $$\div$$ 4 = 3.
Fish Tanks, accessed on Oct. 10, 2018, 2:35 p.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.
Write a multiplication equation and a division equation to represent each of the following situations.
a. Ross has 15 flowers that he wants to make into flower arrangements. Each flower arrangement will use 5 flowers. How many flower arrangements can he make?
b. Heidi has 8 apps that she wants to place into rows of 4. How many apps will there be in each row?
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Cesar says that he can solve the equation $$35 \div 5$$ by thinking about the multiplication problem $$5\times $$ ___$$=35$$. Do you agree or disagree? Explain.
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