Q1
What is 2.5 × 1.2?
A3.0
B3.5
C2.7
D1.3
ICSEClass 7 (ICSE)MathematicsCh 4 · Topic 1
Decimal Fractions (Decimals)
Decimal operations include addition, subtraction, multiplication, and division, essential for handling money, measurements, and precise calc
Core concept
Multiplying decimals involves multiplying as whole numbers, then placing the decimal point based on the total decimal places in both numbers.
How it works
For example, 2.5 × 1.2: multiply 25 × 12 = 300, then place the decimal point two places from the right, giving 3.00 or 3.
Why it matters
Dividing decimals often involves moving the decimal point in both numbers to make the divisor a whole number before dividing.
Key detail
Mastering decimal operations is essential for accurate financial calculations, scientific measurements, and everyday problem-solving.
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Quick notes
• Multiply decimals as whole numbers first.
• Then place the decimal point based on total decimal places.
• 5 × 1.2 = 3.00 (or 3).
• Dividing decimals involves adjusting the divisor to a whole number.
• This makes division easier.
• Decimal operations matter for money.
• They matter for scientific measurements.
• Practice builds accuracy with decimals.