JHS2 Mathematics · Term 1, Week 8

Number Operations

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number Operations (1.2)
Content standard: B8.1.2.2 - Apply the understanding of the addition, subtraction, multiplication and division of (i) whole numbers within 10,000, and (ii) decimals up to 1/1000, to solve problems and round answers to given decimal places.
Indicator: B8.1.2.2.2 - Multiply or divide multi-digit numbers by 2- and 3-digit numbers.
Suggested placement: Term 1, Week 8 (Week 8 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. 96
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g.1 Use the area model (Expand and Box method) to multiply and divide efficiently. 526 × 54 =

Wide colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions,... — A wide colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions, coloured regions. Visible labels, values, and notation include: 500; 500×50; =25000; 500×4; = 2000; 20; 20×50; = 1000; 20×4; = 80; 6; 6×50; = 300; 6×4; = 24; 50; 4.

∴ 526 × 54 = 25, 000 + 2, 000 + 1, 000 + 300 + 80 + 24 = 28, 404
E.g.2. Multiply whole numbers using the vertical place value method: (i.e. 657 × 27 =) 657 x27 4599
+ 1314 17739
E.g.3 Multiply whole numbers using the lattice method: That is to solve 382 × 856: Make a 3 by 3 lattice and set up the solution as follows:

Wide colour mathematical teaching visual is organised as a worked calculation with vertical divisions, coloured... — A wide colour mathematical teaching visual is organised as a worked calculation with vertical divisions, coloured regions, open white space around the main marks. Visible labels, values, and notation include: 382 × 856 = 326,992; 3, 8; 2; 1; 476; 8; 6.

382 × 856 = 326,992
E.g.3 Use the distributive property to multiply 325x 15 =325 x (10 + 5) = (325 x 10) + (325 x 5) =3,250 + 1,625 =4,875
E.g.4 Investigate and determine basic division facts including divisibility test
(i) Determine how a given number is divisible by 3,4,5, 6, 7, 8,9,10, etc.

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