Question

# What is the exponent (∗) in 1.3×10∗=13,000?

A
3
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B
4
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C
5
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D
6
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Solution

## The correct option is B 4Need to find:–––––––––––––––– The exponent (∗) in 1.3×10∗=13,000 ∙ Multiplying by 10=101: Decimal point moves 1 unit to the right, i.e., 1.3×10=13.0=13 ∙ Multiplying by 100=102: Decimal point moves 2 units to the right, i.e., 1.3×100=130.0=130 ∙ Multiplying by 1,000=103: Decimal point moves 3 units to the right, i.e., 1.3×1,000=1,300.0=1,300 ∙ Multiplying by 10,000=104: Decimal point moves 4 units to the right, i.e., 1.3×10,000=13,000.0=13,000––––––––––––––––––––––––––––––––––––– ∴1.3×10,000=1.3×104=13,000.0=13,000–––––––––––––––––––––––––––––––––– Hence, the exponent (∗) in 1.3×10∗=13,000 is 4––, i.e., option (b.) is the correct one.

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