NUMBER SENSE AND BASIC OPERATIONS

? Number Sense & Basic Operations (Grades 1–5 Maths Notes) ? 1. Numbers & Place Value ? Notes Numbers help us count and measure. Every digit has a place value. Place Value Ones 1 Tens 10 Hundreds 100 Thousands 1000 ? Example: 345 3 Hundreds 4 Tens 5 Ones ? Flash Cards What is place value? ? Value of digit based on position 5 in 52 = ? ? 50 Expanded form of 234 ? 200 + 30 + 4 ? 2. Addition ? Notes Addition means joining numbers. Example: 23 + 15 = 38 Steps: Add Ones Add Tens Carry if needed ? Flash Cards Addition means? ? Putting together 7 + 5 = ? ? 12 Symbol of addition ? + ? 3. Subtraction ? Notes Subtraction means taking away. Example: 45 ? 12 = 33 Steps: Subtract Ones Subtract Tens Borrow if needed ? Flash Cards Subtraction means? ? Take away 10 ? 6 = ? ? 4 Symbol ? ? ?? 4. Multiplication ? Notes Multiplication = Repeated Addition Example: 4 × 3 = 12 (3 + 3 + 3 + 3) Learn tables 2–12. ? Flash Cards Multiplication means? ? Repeated addition 5 × 2 = ? ? 10 Symbol ? × ? 5. Division ? Notes Division means sharing equally. Example: 12 ÷ 3 = 4 Terms: Dividend ? Number being divided Divisor ? Number dividing Quotient ? Answer ? Flash Cards Division means? ? Equal sharing 20 ÷ 5 = ? ? 4 Symbol ? ÷ ? 6. Fractions (Grade 3–5) ? Notes Fraction shows part of a whole. Example: ½, ¼, ¾ Numerator ? Top number Denominator ? Bottom number ? Flash Cards ½ means? ? One part of two Top number ? Numerator Bottom number ? Denominator ? 7. Decimals (Grade 4–5) ? Notes Decimals represent parts less than 1. Example: 0.5 = half 1.25 = one and twenty-five hundredths ? Flash Cards Decimal point symbol ? . 0.1 = ? ? One tenth 1 rupee = ? paise ? 100 paise