options: Understand division as an unknown-factor problem. For example, find 32 ÷ 8 by finding the number that makes 32 when multiplied by 8.

Apply properties of operations as strategies to multiply and divide. (Students need not use formal terms for these properties.) ^( )Examples: If 6 × 4 = 24 is known, then 4 × 6 = 24 is also known. (Commutative property of multiplication.) 3 × 5 × 2 can be found by 3 × 5 = 15, then 15 × 2 = 30, or by 5 × 2 = 10, then 3 × 10 = 30. (Associative property of multiplication.) Knowing that 8 × 5 = 40 and 8 × 2 = 16, one can find 8 × 7 as 8 × (5 + 2) = (8 × 5) + (8 × 2) = 40 + 16 = 56. (Distributive property.)
problem_activity: Problem 1
Katia and Gerard are stocking shelves at the grocery store. Katia stocks 3 shelves with 7 boxes of cereal on each shelf. Gerard stocks 7 shelves with 3 boxes of cereal on each shelf.
Katia says they put the same number of cereal boxes on each shelf. Gerard says they didn’t, since they stocked a different number of boxes on each of a different number of shelves. Who do you agree with, Katia or Gerard? Explain.
Problem 2
Fill in the facts you know on the multiplication table below.
{"table": [{"_attributes": {"class": ["table", "table-bordered"], "style": "table-layout:fixed; width:100%"}, "tbody": [{"tr": [{"td": [{"_attributes": {"style": "background-color:#3399ff; text-align:center"}, "strong": [{"_value": "\u00d7"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "1"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "2"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "3"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "4"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "5"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "6"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "7"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "8"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "9"}]}, {"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "10"}]}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "1"}]}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "2"}]}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "3"}]}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "4"}]}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "5"}]}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "6"}]}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}, {"_attributes": {"style": "background-color:#ffffff; text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "7"}]}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "8"}]}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "9"}]}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}]}, {"td": [{"_attributes": {"style": "background-color:#99ccff; text-align:center"}, "strong": [{"_value": "10"}]}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}, {"_attributes": {"style": "text-align:center"}}]}]}]}]}
Problem 3
Solve.
a.
$$4 \times 8 =a $$
b.
$$18 = b \times 6$$
c.
$$c= 35 \div 7$$
d.
$$9 = 18 \div d$$


correct_option_index: 1