Operations on integers
Answers are for parents and teachers.
1
Find −9 + 4 and −9 + (−4).
−9 + 4 = −5 and −9 + (−4) = −13.
2
Find 5 − 12 and −6 − (−10).
5 − 12 = 5 + (−12) = −7 and −6 − (−10) = −6 + 10 = 4.
3
Find (−7) × (−4) and (−7) × 4.
(−7) × (−4) = 28 and (−7) × 4 = −28.
4
Find −56 ÷ 8 and 0 ÷ (−3).
−56 ÷ 8 = −7 and 0 ÷ (−3) = 0.
5
At night the temperature was −3 °C and at noon it was 11 °C. By how many degrees did it rise?
11 − (−3) = 11 + 3 = 14 °C.