The difference of which of the following pairs of numbers will be 790, if first number is rounded off to nearest ten and second number is rounded off to nearest hundred?

1887 and 1121

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1121 and 1191

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1499 and 792

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1787 and 1110

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Solution

The correct option is A 1887 and 1121
Let's round off the options and verify our results:
a)1887 and 1121:
1887 - round off to nearest ten = 1890
1121 - round off to nearest hundred = 1100
Difference = 1890-1100 = 790

b) 1787 and 1110:
1787- round off to nearest ten = 1790
1121 - round off to nearest hundred = 1100
Difference = 1790-1100 = 690

c) 1121 and 1191:
1121- round off to nearest ten = 1120
1191- round off to nearest hundred = 1200
Difference = 1200-1120 = 80

d) 1499 and 792:
1499- round off to nearest ten = 1500
792- round off to nearest hundred = 800
Difference = 1500-800= 700

Thus, a) is the correct answer.

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