SME
Grade 7 Math · Problem type
The sign of the answer
Use this for “Is (−5) × (−7) positive or negative?” before working it out.
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What is the sign of the answer?
Tap a card, then tap its group.
Assumptions
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Multiply or divide: the same signs give a positive, different signs a negative.
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Add: the answer takes the sign of the number farther from 0. Opposites make 0.
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Subtract: add the opposite, then use the adding rule.
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Zero times any number is 0, which is neither positive nor negative.
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Related lessons
Operations with positive and negative rational numbers
Main lesson
Adding with counters
Use this for “Show 3 + (−5) with counters.”
Subtracting signed numbers
Use this for “−3 − 8” and “How many feet higher is 1,640 ft than −212 ft?”
Multiplying and dividing signed numbers
Use this for “(−6)(−4)” and “54 ÷ (−9)”.
Fractions as decimals
Use this for “Write 3/8 as a decimal” or “Which decimal is closest to 13/16?”