What repeated addition equation can you write to find the number of objects
in the array (Part A)?
4 + 4 + 4 + 4 + 4 = 20, or
5 + 5 + 5 + 5 = 20.
What multiplication equation can you write to represent the array?
What are the factors in the equation? What do they stand for?
4 and 5 are the factors; they stand for the number of groups and the size of each group.
What is the product? What does it stand for?
20 is the product; it stands for the total number of objects.
Look at Part B. What division equation can we write to represent the problem?
36 is the dividend and 4 is the divisor. What do these values mean in context?
36 is the total number of objects, and 4 is the number of groups the objects are broken into.
What is the quotient? What does it mean in context?
9 is the quotient; it is the size of each group (the number of blocks in each tower).
Look at the Part C. Two methods are shown for adding the numbers. Are they correct? Why or why not?
Yes; if you break apart or change the order of addends, the sum will stay the same.
How do these strategies make this problem simpler?
They rearrange and group numbers to form multiples of 10, which are easier to work with.
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