Page 49 - ICSE Math 6

2. Subtract the following.
(a) –6 from –9 (b) –15 from –20 (c) 105 from –95

(d) –21 from 0 (e) –51 from 62 (f) 125 from 22
3. Using a number line, fill in the following blanks.
(a) 2 – 7 = – (7 – _____ ) (b) –12 – (–6) = _____

(c) –5 – (–9) = _____ (d) –(4 – 2) + 3 = _____
4. Add the following integers using the number line.
(a) 8 and 2 (b) –7 and –5
(c) –12 and 9 (d) –9 and –3
5. Subtract the following integers using the number line.

(a) –2 from –6 (b) –5 from 9
(c) 3 from 7 (d) 6 from –10
6. Use a number line to arrange the following integers in descending order.

(a) 7, –6, 4, –9, 5, 0 (b) –8, 3, –4, 1, –5
7. Evaluate.
(a) +18 + (–12) – (–6) – (–9) (b) –201 + 253 – (–56) – 0
(c) –1 + (–74) + 190 + (–5) (d) –204 + 5 + 21
(e) –75 + 65 – (–105) (f) –113 – (–23) + 90 – 50

AT A GLANCE

¾ The numbers ..., –4, –3, –2, –1, 0, 1, 2, 3, 4, ... are called integers.
¾ The number zero is an integer which is neither positive nor negative.
¾ The number 0 is less than every positive integer and greater than every negative integer.
¾ The numerical value of an integer, regardless of its sign, is known as its absolute value.

MENTAL MATHS

1. Write True or False.

(a) |–21| = |21| (b) –|–5| + |5| = 0 (c) –|105| = |105| (d) –|19| = |–19|
(e) If +100 represents a profit of ` 100, then –50 represents a profit of ` 50.
(f) If +20 represents rise in temperature of a body by 20ºC, then –91 represents fall in temperature
by 91ºC.

2. Fill in the blanks.
(a) |9| – |–9| = ______ (b) |–18| + |9| = ______ (c) |7| + |–7| = ______

(d) |5| + |0| = ______ (e) |–5| + |5| = ______ (f) |120| – |–20| ______

3. Fill in the boxes with ‘>’, ‘<’, or ‘=’.

(a) –11 9 (b) –17 17 (c) 1 0

(d) 11 +11 (e) –2 1 (f) 7 –8

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