7 km -4200 m -A- 2 km 800 mB- 2 km 200 mC- 3 km 200 mD- 3 km 800 m

The correct option is A 2 km 800 m nbsp; nbsp; nbsp; 1 km = 1000 m nbsp; ⇒ 7 km = 7× 1000 m = 7000 m ⇒ 7 km 4200 m = 7000 m 4200 m nbsp; nb ...

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Standard VI

Mathematics

Operations on Measurements

7 km -4200 m ...

Question

7 km - 4200 m = ___

3 km 800 m

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2 km 800 m

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3 km 200 m

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2 km 200 m

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Solution

The correct option is B 2 km 800 m
1 km = 1000 m
$\Rightarrow$ 7 km = 7 $\times$ 1000 m = 7000 m
$\Rightarrow$ 7 km - 4200 m = 7000 m - 4200 m
= 2800 m
But, 2800 m = 2000 m + 800 m.

1000 m = 1 km
$\Rightarrow$ 2000 m = 1000 m + 1000 m
= 1 km + 1 km
= 2km

$∴$ 7 km - 4200 m = 2000 m + 800 m
= 2 km + 800 m

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7 km - 4200 m = ___

The correct option is B 2 km 800 m 1 km = 1000 m ⇒ 7 km = 7× 1000 m = 7000 m ⇒ 7 km - 4200 m = 7000 m - 4200 m = 2800 m But, 2800 m = 2000 m + 800 m. 1000 m = 1 km ⇒ 2000 m = 1000 m + 1000 m = 1 km + 1 km = 2km ∴ 7 km - 4200 m = 2000 m + 800 m = 2 km + 800 m