2. To model (-3) x (-5), Raini places 15 zero pairs on her desk.
2a. Why did she use 15 zero pairs?
Answer: She used 15 zero pairs because she modeled it with (-3) x (-5). She modeled it like this:
2b. What should she do next?
Answer: She should take away the negative zero pairs to get her answer. +15
7. Write each multiplication as a repeated addition
7a. (+3) x (+8)
Answer: 3 groups of 8 (+8) + (+8) + (+8) = (+24)
7b. (+5) x (-6)
Answer: 5 groups of Negative 6 (-6) + (-6) + (-6) + (-6) + (-6) + (-6) = (-36)
11. What multiplication statement does each set of diagrams represent?
11a.
Answer: 3 Negative Zero pairs taken away equals (+6)
11b.
Answer: Take away 3 groups of positive 3 equals (-9)
16. A building has 10 stories above ground and 3 stories below ground. Each story has a height of 4m.
16a. What is the total height of the building above ground?
Answer: (+10) x (+4) = (+40)
16b. What is the total depth of the builiding below ground?
Answer: (-3) x (+4) = (-12)
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