Number Operations · JHS1 Mathematics

Lesson notes

Learning Objectives

Indicator: B7.1.2.2.1 - Add and subtract up to four-digit numbers.

By the end of the lesson, learners can:

Add up to four-digit whole numbers using the expanded form (partitioning) method, with correct regrouping where needed.
Subtract up to four-digit whole numbers using the expanded form method, with correct borrowing where needed.
Add decimal numbers with up to two decimal places by aligning place values (tenths, hundredths, units, tens, hundreds).
Subtract decimal numbers with up to two decimal places by aligning place values and regrouping correctly.
Verify their answers by performing a reverse operation (inverse check) to confirm accuracy.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number Operations (1.2)
Content standard: B7.1.2.2 - Demonstrate an understanding of addition, subtraction, multiplication and division of (i) whole numbers, and (ii) decimal numbers, to solve problems.
Indicator: B7.1.2.2.1 - Add and subtract up to four-digit numbers.
Suggested placement: Term 1, Week 4 (Week 4 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: Mathematics, Common Core Programme (JHS1-JHS3), 2023, p. 9
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g.1. Use partitioning (or expanded form) and place value system to add and subtract whole and decimal numbers.
i) Add 785 and 9,342 785 = 700+80+5 + = 9000+300+40+2
9,342
10,127 = 9000+1000+120+7
ii) Add 327.6 and 54.13 300 + 20 + 7 + 6 + 0 ---
327.60 = 10 100
-
+ 54.13 = 50 + 4 + 1 + 3 10 100
381.73 = 300+ 70+ 11+ 7 + 3 10 100
iii) Subtract 7.85 from 93.6 93.60 = 90 + 3+ 6 + 0 - --- 10 100
- 7.85 = 7+ 8 + 5 10 100
85.75 = 80 + 5 + 75 ---- 100