- Example 1: Value of 6 in 46,372 = 6,000 (six thousand)
- Example 2: Write 7,208 in words. Seven thousand, two hundred eight.
- Example 3: Which is larger: 23,465 or 23,456? 23,465 — compare left to right; tens place decides.
- Example 4: Round 12,345 to the nearest ten. 12,350
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JSS1 FIRST TERM E-NOTE
JSS1 E-Note Series — Edwin Ogie Library
1. Number & Place Value
Place value is the value a digit holds depending on its position in a number. JSS1 students should read, write and compare numbers up to 100,000 and understand place names (units, tens, hundreds, thousands).
4 examples — tap to view
2. Addition & Subtraction (Whole numbers)
Methods: column addition/subtraction, mental strategies, checking with inverse operations.
4 examples — tap to view
- Example 1: 3,456 + 2,789 = 6,245
- Example 2: 10,000 − 2,347 = 7,653
- Example 3: Use inverse to check 4,321 + ? = 7,000 → ? = 2,679 Check: 4,321 + 2,679 = 7,000
- Example 4: Subtract with borrowing: 5,000 − 1,289 = 3,711
3. Multiplication & Division (Basics)
Times tables, long multiplication, short division and division with remainder.
4 examples — tap to view
- Example 1: 24 × 13 = 312
- Example 2: 144 ÷ 12 = 12
- Example 3: 75 ÷ 8 = 9 remainder 3 (9 R 3)
- Example 4: Multiply: 307 × 6 = 1,842
4. Fractions (intro)
Types (proper, improper, mixed), equivalent fractions, addition/subtraction with common denominators, simple multiplication/division.
4 examples — tap to view
- Example 1: Simplify 6/8 = 3/4
- Example 2: Add 1/4 + 2/4 = 3/4
- Example 3: Convert 7/4 to mixed number = 1 3/4
- Example 4: Multiply 2/3 × 3/5 = 6/15 = 2/5
5. Decimals & Percentages (intro)
Understanding place values after the decimal point, converting between fractions/decimals/percentages.
4 examples — tap to view
- Example 1: 0.75 = ?% → 75%
- Example 2: 2.5 + 1.75 = 4.25
- Example 3: 40% of 80 = 32
- Example 4: Convert 3/20 to decimal = 0.15
6. Ratio & Proportion (basics)
Understanding ratios, simplest form, sharing in a given ratio and solving simple proportion problems.
4 examples — tap to view
- Example 1: Simplify 8:12 = 2:3
- Example 2: Share 50 in ratio 2:3 → 20 and 30
- Example 3: If 3/x = 6/12 → x = ? x = 6
- Example 4: A map scale 1:100 means 1cm = 100cm → 3cm = 3m
7. Measurement
Units (length, mass, capacity), conversion (mm, cm, m, km; g, kg), perimeter and area basics (rectangle, triangle), simple volume (cube/cuboid).
4 examples — tap to view
- Example 1: Convert 1500 m to km = 1.5 km
- Example 2: Area of rectangle l=8cm b=5cm = 40 cm²
- Example 3: Volume of cuboid 2×3×4 = 24 cm³
- Example 4: Perimeter of square side 6 cm = 24 cm
8. Geometry & Shapes
Names and properties of shapes: triangle types, quadrilaterals, angles (acute/obtuse/right), symmetry, simple constructions.
4 examples — tap to view
- Example 1: Sum of interior angles of triangle = 180°
- Example 2: Right angle = 90°
- Example 3: Properties of square: 4 equal sides, 4 right angles.
- Example 4: Line of symmetry of an isosceles triangle = 1 (through apex)
9. Data Handling (intro)
Collecting data, tallying, frequency tables, bar charts and finding mean (average) for simple data sets.
4 examples — tap to view
- Example 1: Data: 2,3,4 → mean = (2+3+4)/3 = 3
- Example 2: Tally marks for 5,5,4,5 → frequency table: 5→3,4→1
- Example 3: Simple bar chart: show frequencies visually.
- Example 4: Mode of 2,2,3,4 = 2
10. Basic Algebra
Using letters for numbers, solving simple linear equations, evaluating expressions by substitution.
4 examples — tap to view
- Example 1: If x + 5 = 12, x = 7
- Example 2: Evaluate 2a when a=3 → 6
- Example 3: Solve 3x = 15 → x = 5
- Example 4: Simplify 2x + 3x = 5x

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