(-4)X(-1)X(-1) math class 7 practice question.
Answers
= (-4)X(-1)X(-1)
= (-4)X(1)
= -4
Hope it helps...
. Verify a – (-b) = a + b for the following values of a and b.
i) a = 15, b = 9
ii) a = 75, b = 55
2. Use the sign >, <, or = to make the statements true.
i) (-6) + (-4) …………… (-6) – (-4)
ii) (-2) + 6 – (12) ……………….. 14 – 9 + (-8)
3. Write down a pair of integers whose
i) Sum is -4
ii) Difference is -6
4. Fill in the blanks to make the following statements true:
i) (-3) + (-7) = (-7) + ——–
ii) -65 + ——- = -65
iii) 23 + ——— = 0
iv) [12 + (-4)] + —- = 12 + [(-4) + (-7)]
5. Find each of the following products:
i) (-65) x (-10) x 9
ii) (-20) x (-2) x (-3) x (5)
6. Find each of the following products:
i) (-12) x 0 x (-56)
ii) (-654) x 1
iii) (-1) x (-2) x (-3) x (-4)
7. Determine the integer whose product with (-1) is
i) -26
ii) 26
iii) 0
8. Find the product using suitable properties:
i) 25 x (-42) + (-42) x (-35)
ii) 25 x (-76) x 4
9. Simplify
i) 35 – (2 x 5) + 15
ii) -25 x 102
10. Write a pair of negative integers whose difference gives 6.
ANSWERS:
1. i) a = 15, b= 9
LHS = a – (-b) = 15 – (-9) = 15 + 9 = 24
RHS = a + b = 15 + 9 = 24.
Both are equal, so verified.
ii) a = 75, b = 55
LHS = a – (-b) = 75 – (-55) = 75 + 55 = 130
RHS = a + b = 75 + 55 = 130.
Both are equal, so verified.
2. i) (-6) + (-4) = -10
(-6) – (-4) = -6 + 4 = -2
So (-6) + (-4) < (-6) – (-4)
ii) (-2) + 6 – (12) = -2 + 6 + (-12) = (-14) + 6 = -8
14 – 9+ (-8) = 14 + (-9) + (-8) = 14 + (-17) = -3
So (-2) + 6 – (12) < 14 – 9 + (-8)
3. i) -1 and -3
ii) -10 and -4
4. i) (-3) + (-7) = (-7) + (-3)
ii) -65 + 0 = -65
iii) 23 + (-23) = 0
iv) [12 + (-4)] + (-7) = 12 + [(-4) + (-7)]
5 i) (-65) x (-10) x 9 = 5850
ii) (-20) x (-2) x (-3) x 5 = -600