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Estimate the following by rounding off each factor to nearest hundreds:
i) 730 + 998
ii) 796 – 314
iii) 875 – 384
i) 700 + 1000 = 1700
ii) 800 – 300 = 500
iii) 900 – 400 = 500
Estimate the following by rounding off each factor to nearest thousands:
i) 12904 + 2888
ii) 28292 – 21496
i) 13000 + 3000 = 16000
ii) 28000 – 21000 = 7000
Estimate the following by rounding off each number to its greatest place:
i) 439 + 334 + 4317
ii) 8325 – 491
iii) 108734 – 47599
iv) 898 × 785
v) 9 × 795
vi) 87 × 317
i) 400 + 300 + 4000 = 4700
ii)8000 – 500 = 7500
iii)100000 -500000 = 50000
iv) 900 × 800 = 720000
v) 10 × 800 = 8000
vi) 90 x 300 = 27000
Find the estimated quotient for each of the following by rounding off each number to its greatest place :
i) 878 ÷ 28
ii) 745 ÷ 24
iii) 4489 ÷ 394
i) 900 ÷ 30 = 30
ii) 700 ÷ 20 = 35
iii) 4000 ÷ 400 = 10
Write the expression for each of the following statements using brackets:
i) Four multiplied by the sum of 13 and 7
ii) Eight multiplied by the difference of four from nine.
iii) Divide the difference of twenty eight and seven by 3.
The sum of 3 and 7 in multiplied by the difference of twelve and eight.
i) 4 × (13 + 7)
ii) 8 × (9 – 4)
iii) 28 – 73
iv) (3 + 7) x (12 – 8)
Simplify each of the following:
i) 124 – (12 – 2) × 9
ii) (13 + 7) × (9 – 4) – 18
iii) 210 – (14 – 4) x (18 + 2) – 10
i) 34
ii) 82
iii) 0
i) 7 × 109
ii) 6 × 112
iii) 9 × 105
iv) 17 × 109
v) 16 × 108
vi) 12 × 105
vii) 102 × 103
viii) 101 × 105
ix) 109 × 107
i) 763
ii) 672
iii) 945
iv) 1853
v) 1728
vi) 1260
vii) 10506
viii)10605
ix)11663
Write the roman – numerals for each of the following:
i) 33
ii) 48
iii) 76
iv) 95
i) XXXIII
ii) XLVIII
iii) LXXVI
iv) XCV
Write the following in roman numerals:
i) 154
ii) 173
iii) 248
iv) 319
i) CLIV
ii) CLXXIII
iii) CCXLVIII
iv) CCCXIX
i) 1008
ii) 2718
iii) 3906
iv) 3794
i) KVIII
ii) KKDCCXVIII
iii) KKKCKVI
iv) KKKDCCXCIV
i) 4201
ii) 10009
iii) 44000
iv) 25819
Write the following in Hindu – Arabic numerical:
i) XXVI
ii) XXIX
iii) LXXII
iv) XCI
i) 26
ii) 29
iii) 72
iv) 91
Write the corresponding Hindu – Arabic numerical for each of the following:
i) CIX
ii) CLXXII
iii) CCLIV
iv) CCCXXIX
i) 109
ii) 172
iii) 254
iv) 329
i) KXIX
ii) KDLXV
iii) KKCXXIII
iv) KKKDCXL
i) 1019
ii) 1565
iii) 2123
iv) 3640
i) 4444
ii) 6949
iii) 9391
iv) 70009
Which of the following is meaningless?
ii) KKKCCXI
iii) XD
iv) VC
(i) and (iii) are meaningless.
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Chapter 1: Knowing Our Numbers – Exercise...