🔊 Read All Rules
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➕ Addition 🔊 Hear
Add means put together. Start from the ones place. Add digits column by column. Carry over if sum ≥ 10. 34 + 28 = 62 | 1,200 + 800 = 2,000
Adding with 0: Any number + 0 = that number itself. 57 + 0 = 57
➖ Subtraction 🔊 Hear
Subtract means take away. Start from ones. Borrow from the next column if needed. 52 − 17 = 35 | 1000 − 250 = 750
Subtracting 0: Any number − 0 = that number. 89 − 0 = 89
✖ Multiplication 🔊 Hear
Multiply means repeated addition. 4 × 3 = 4 + 4 + 4 = 12. Order doesn’t matter: 3 × 4 = 4 × 3. 7 × 8 = 56 | 12 × 5 = 60
Multiply by 10, 100, 1000: Add 1, 2, or 3 zeros to the right. 7 × 10 = 70 | 7 × 100 = 700 | 7 × 1000 = 7000
÷ Division 🔊 Hear
Divide means share equally. 20 ÷ 4 = 5 means share 20 into 4 equal groups. 48 ÷ 6 = 8 | 100 ÷ 5 = 20
Division by 1: Any number ÷ 1 = itself. 63 ÷ 1 = 63
🔢 Place Value & Numbers 🔊 Hear
Place Value Chart (Indian System): Ones | Tens | Hundreds | Thousands | Ten-Thousands | Lakhs | Ten-Lakhs | Crores 35,72,046 = 3 Crores + 5 Ten-Lakhs + 7 Lakhs + 2 Ten-Thousands + 46
Rounding Rules: Look at the digit to the right. If it is 5 or more, round up. If less than 5, round down. 347 rounded to nearest 100 = 300 | 650 rounded to nearest 100 = 700