B6 Mathematics · Term 1 Week 10: Number Operations

Lesson notes

Learning Objectives

Indicator: B6.1.2.2.1 - Multiply multi digit numbers by 2 or 3-digit numbers efficiently

By the end of the lesson, learners can:

Multiply a 3-digit number by a 2-digit number using the expand and box (partial decomposition) method, showing each partial product clearly.
Multiply a 2-digit number by a 2-digit number using the column (vertical) method with correct place value alignment.
Apply the distributive property to break down and solve multiplication of 2-digit by 2-digit numbers.
Use the lattice method to multiply a 3-digit number by a 2-digit number accurately.
Choose and justify an efficient multiplication method when solving a word problem involving a 2-digit or 3-digit multiplier.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number Operations (1.2)
Content standard: B6.1.2.2 - Demonstrate understanding of multiplication of a 2 or 3-digit number by a 2 or 3-digit number.
Indicator: B6.1.2.2.1 - Multiply multi digit numbers by 2 or 3-digit numbers efficiently
Suggested placement: Term 1, Week 10 (Week 10 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 Curriculum for Primary Schools (Basic 4-6), 2019, p. 125
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Multiplication of whole numbers using the "expand and box" method (partial decomposition method). Lead learners to multiply a 3-digit number by a 1-digit number as shown below, for example 448 × 2 =? × 400 40 8
2 800 80 16
448 × 2 = (400 × 2) + (40 × 2) + (8 × 2) = 800 + 80 + 16 = 800 + 80 + (10 + 6) = 800 + 90 + 6 = 896

Figure from the b6 mathematics curriculum, printed page 125

E.g. 2. Multiplication of whole numbers using the Column or vertical method; i.e. 25×32
E.g. 3. Multiplication of whole numbers using the Distributive property; i.e. 25×32

E.g. 4. Multiplication of whole numbers using the lattice method. Have learners draw a 2 by 3 lattice for solving 345 × 27; and 3 by 3 and 3 by 3 lattice for solving 382 × 856.