Convert $25 k m 356 m 79 c m 3 m m$ into millimetres. Write the answer in words in
(a) Indian System of Numeration
(b) International System of Numeration

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Solution

Convert all units into millimeters.
$25 k m = 25 \times 1000000 m m = 25000000$ $[1 k m = 1000000 m m]$
$356 m = 356 \times 1000 m m = 356000 [1 m = 1000 m m] 79 c m = 79 \times 10 m m = 790 [1 c m = 10 m m]$
So,
$25000000 + 356000 + 790 + 3 = 25356793 m m$
In the Indian System of Numeration:
(a) $25356793 = 2, 53, 56, 793 =$ Two crores fifty-three lakh fifty-six thousand seven hundred ninety-three.
In the International System of Numeration
(b) $25356793 = 25, 356, 793 =$ Twenty-five million three hundred fifty-six thousand seven hundred ninety-three.

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