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Practice Time 10C

1. Fill in the blanks to make the statement true:

(a) (–19) + (–11) = (–11) + (..........)

(b) (–235 ) + .......... = –235
(c) 2367 + (–1234) = .......... + 2367

(d) 675 + {–345 + (–888)} = {.......... + (–345)} + (..........)

2. On the number line, find the difference:
(a) 7 – 3 (b) – 9 – (–9) (c) 4 – 6

3. Subtract the following integers:

(a) –18 from 9 (b) –12 from –3 (c) –9 from –7
(d) –5 from –13 (e) +134 from +1695 (f) +89 from –54

4. Replace * by < or > in each of the following to make the statement true.

(a) (–15) + (–23) * (–12) + (–32) (b) (–12 ) + 23 – (–43) * 92 + (–34) – (–23)
(c) (–20) – (–20) + 30 * 20 + (–650) + (–12) (d) 123 – (–233) * 234 – (0 – 14 + 17)

5. Simplify:

(a) [58 – (–8)] + [12 – (–6)] (b) [–24 – (–32)] + [–52 – (–36)]
6. Evaluate the following:

(a) – 45 + 242 – 32 + 67 – 777 – 23 + 721 – 34 (b) –23 + 34 – 45 + 56 – 67 + 78 – 89 + 98 – 100

(c) 12 – 23 + 33 – 445 – 566 + 66 – 888 + 34 (d) 5 – 55 + 555 – 5555 + 654
7. Subtract:

(a) the sum of –160 and 175 from the sum of 115 and –315.

(b) –5308 from the sum [(–2100) + (–2001)]
8. The sum of two integers is 85. If one of the integers is –17, find the other.

9. Utkarsha participated in an inter-school poem recitation competition. Her scores in the five rounds
were 12, –9, 4, 6, and –3. What was his final score?

10. The temperature of a place at 10:00 a.m. was +8°C. It got increased by 5°C in the first hour and
decreased by 3°C in the second hour. What was the temperature at noon?

11. In a quiz competition, Nilabh scored –10, 20, –5, –20 and 50 while Nishtha scored 0, –30, 10, 50 and
–20 in five successive rounds. Who scored more?
12. Jogging is one of the most effective forms of exercise. Usually, a person burns more calories per

minute by jogging than in other sports. Aakriti also jogs daily in the morning and burns 380 calories.
One day, she had an ice cream in the evening with 207 calories. Did Aakriti gain or lose calories that
particular day, and by how much?

293 The Other Side of Zero