By the end of this lesson, students will be able to:
Subtract two-digit numbers, including those that require exchanging or renaming (borrowing).
Subtract three-digit numbers accurately.
Subtract three numbers by taking two at a time, performing the operation in sequential steps.
Subtract fractions that have the same denominator (bottom number).
Lesson summary
This topic introduces learners to the fundamental operation of subtraction, building on their prior knowledge of taking away and finding the difference. It is a critical skill for daily numerical tasks, essential for developing financial literacy, problem-solving abilities, and logical reasoning. Mastery of subtraction, particularly with exchanging (renaming), is foundational for more complex mathematical concepts.
Teacher activity
Guides pupils to arrange counters in bundles of tens and write e.g. 35 stones = 3 bundles of stone and 5 piece.
Guides pupils to count and say the numbers in the expanded form and be able to write the numerals in that form.
Guides pupils in solving some subtraction problems in volving 2-digit numbers e.g.54 - 47 = _____
Guides pupils to identify the number of tens and units e.g.54 = 40 + 14 = 5 4-47 = 40 + 7 - 4 77 7
Evaluation guide
Observation: The teacher will observe students during individual and group activities, paying attention to their use of manipulatives, understanding of the exchanging process, and participation in discussions.
Questioning: Ask direct questions to check for understanding throughout the lesson (e.g., "Why did you need to borrow here?", "What happens to the denominator when subtracting fractions?").
Checking Independent Practice: Review student work from the independent practice exercises.
The following questions can be used for a short quiz or
Reference guide
Counters such as stones, sticks, bottle to ps, etc. Charts, Abacus, subtraction cards, Fraction board, Flash cards, etc.
