Concept 10 of 11Foundation
Watch on YouTubeVideoAdding, subtracting, multiplying decimals
Adding / subtracting: line up the decimal points carefully, then add or subtract as usual. Fill missing places with zeros.
Multiplying: ignore the decimal points, multiply the numbers, then place the decimal so the answer has as many decimal places as the TOTAL in the two numbers.
Dividing: shift decimal points in both numbers so the divisor becomes a whole number; then divide normally.
Example
Add 2.3 + 1.47: line up → 2.30 + 1.47 = 3.77.
0.2 × 0.3: ignore dots → 2×3=6. Total decimals = 1+1=2 → 0.06.
1.5 ÷ 0.3: shift → 15 ÷ 3 = 5.
0.2 × 0.3: ignore dots → 2×3=6. Total decimals = 1+1=2 → 0.06.
1.5 ÷ 0.3: shift → 15 ÷ 3 = 5.
💡 Tip:Write zeros to align place values. 2 + 0.47 ≠ 2.47 only if you've lined up correctly (it IS 2.47 when aligned).
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5 questions to check what you just read.
0 / 5
- Q1.2.5 + 1.75 = ?
- Q2.0.6 × 0.3 = ?
- Q3.5 − 1.7 = ?
- Q4.1.5 ÷ 0.3 = ?
- Q5.0.4 × 10 = ?