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Multiply as if there were no points: 2.5 × 4 → 25 × 4 = 100. One decimal place, so 10.0 = 10.
Count decimal places in both numbers: 0.3 × 0.2 has 2 places, so 6 becomes 0.06.
To divide a decimal by a whole number, divide normally and keep the point in place: 8.4 ÷ 4 = 2.1.
