The total mass of 1 000 identical metal washers is 4.75 kg. Amir places exactly 100 of these washers into a bag. What is the mass of the washers in the bag?
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Worked Solution
Step 1: Find the mass of 1 washer.
Mass of 1 washer = 4.75 ÷ 1 000 = 0.00475 kg
(Decimal point moves 3 places to the left.)
Step 2: Find the mass of 100 washers.
Mass of 100 washers = 0.00475 × 100 = 0.475 kg
(Decimal point moves 2 places to the right.)
Alternative: 100 washers = 100/1 000 = 1/10 of all washers.
4.75 ÷ 10 = 0.475 kg ✓
Correct answer: 0.475 kg
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