The Dairy Farm
CBSE · Class 5 · Mathematics
All formulas from The Dairy Farm in CBSE Class 5 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
1. Multiplication Basics
a × b = b × a
Repeated addition
2. Multiplying by 10 and 100
Multiplying by 10 shifts each digit one place value to the left.
Multiplying by 100 shifts each digit two place values to the left.
3. Smart Multiplication Strategies
Nearest multiple strategy for 4 × 19: 4 x 19 = 4 x 20-4 = 80-4 = 76
Area model / distributive multiplication for 69 × 45: 69 (60 + 9) × 45 (40 + 5) 300 + __ = 345 (5 × 69) ____ + ___ = 2760 (40 × 69) = 3,105
4. Word Problems and Units
Distance = 4 km × 31 days = 124 km
Cloth needed for 8 kurtas = 16 m ÷ 4 × 8 = 32 m
Milk from 29 cows = 29 × 5 litres = 145 litres
Fodder for 297 cows = 297 × 18 kg
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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