-3 + -3 + -3 + -3 = ? A quicker way of writing this is 4 x -3, 4 lots of -3. So 4 x -3 = -12.

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Presentation transcript:

-3 + -3 + -3 + -3 = ? A quicker way of writing this is 4 x -3, 4 lots of -3. So 4 x -3 = -12.

-4 + -4 + -4 = ? So we know that 4 x -3 = -12 and we know that 3 x -4 = -12. This is showing us that if we multiply two numbers, and one of them is negative, the result, or product, is also negative.

3 × -8 = ? -4 × 6 = ? How many examples can you find for the last one? Any decimals? ? × ? = -24

-3 × ? = 12 We know that -3 x 4 would be -12, so how can we get 12? The answer is it must be a negative number, -3 x -4 = positive 12. When you multiply two negative numbers, the result is positive.

-5 × -4 = ? -4 × -3 = ? There are two possible answers for the value of a, what are they? a × a = 25

A) -2 × 7 = ? F) -3 × -3 × 4 = ? B) -2 × -4 = ? G) -1 × 4 × -4 = ? C) 5 × -7 = ? H) -7 × 2 × -3 = ? D) -3 × ? = 18 I) -3 × -3 × -3 = ? E) ? × -5 = 20 J) -2 × 5 × -1 = ?

A) -2 × 7 = -14 F) -3 × -3 × 4 = 36 B) -2 × -4 = 8 G) -1 × 4 × -4 = 16 C) 5 × -7 = -35 H) -7 × 2 × -3 = 42 D) -3 × -6 = 18 I) -3 × -3 × -3 = -27 E) -4 × -5 = 20 J) -2 × 5 × -1 = 10

-20 ÷ 4 = ? This is the same question as asking, 4 lots of what make -20? We want to split -20 into 4 equal parts, so the answer must be -5. It follows the same rule as multiplication. If one number is negative, the quotient is negative. If both numbers are negative, the quotient is positive.

-10 ÷ 2 = ? 15 ÷ -3 = ? -18 ÷ -6 = ?

A) -21 ÷ 7 = ? F) (-3 × -6) ÷ 9 = ? B) -15 ÷ -3 = ? G) -2 × (8 ÷ -4) = ? C) 25 ÷ -5 = ? H) (-12 ÷ 2) × -3 = ? D) -30 ÷ ? = -5 I) (-2 × 3) ÷ -3 = ? E) ? ÷ -5 = 20 J) (-20 ÷ 5) × -1 = ?

A) -21 ÷ 7 = -3 F) (-3 × -6) ÷ 9 = 2 B) -15 ÷ -3 = 5 G) -2 × (8 ÷ -4) = 4 C) 25 ÷ -5 = -5 H) (-12 ÷ 2) × -3 = 18 D) -30 ÷ 6 = -5 I) (-2 × 3) ÷ -3 = 2 E) -100 ÷ -5 = 20 J) (-20 ÷ 5) × -1 = 4