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Directions: What approximate value should come in place of question mark.
1
17.92 × 10.97 – 52.11 = ?
» Explain it
A
17.92 × 10.97 – 52.11 = ?
 
? ≈ 18 × 11 – 52
 
? = 146
 
Hence, option A is correct.
2
127.93 × 4.1 – 116.01 × 2.95 = ?
» Explain it
B
127.93 × 4.1 – 116.01 × 2.95 = ?
 
? ≈ 128 × 4 – 116 × 3
 
? = 512 – 348
 
? = 164
 
Hence, option B is correct.
3
101.68 ÷ 5.93 = ? ÷ 11.01
» Explain it
C
101.68 ÷ 5.93 = ? ÷ 11.01
 
102 ÷ 6 ≈ ? ÷ 11
 
? ÷ 11 = 102 ÷ 6
 
? = 17 × 11 
 
? = 187
 
Hence, option C is correct.
4
167.71 ÷ 6.09 × 4.11 = 79.86% of ?
» Explain it
D
167.71 ÷ 6.09 × 4.11 = 79.86% of ?

? ≈ 168 ×  1  × 4 ×  100
6 80

? = 28 × 5

? = 140

Hence, option D is correct.
5
59.71% of (207.93 + 218.09) = (?)2

A
33
» Explain it
E
59.71% of (207.93 + 218.09) = (?)2

(?)2 ≈  60  × (208 + 218)
100

(?)2 = 255.6 ≈ 256

? ≈ 16

Hence, option E is correct.
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