Number Operations · JHS2 Mathematics

Lesson notes

Indicator: B8.1.2.1.2 - Apply mental mathematics strategies and number properties to do calculation

By the end of the lesson, learners can:

Use the halving and doubling strategy to mentally multiply two numbers, given the product of two related numbers.
Apply the distributive property to break apart numbers and simplify multiplication mentally.
Apply the associative and commutative properties to rearrange numbers for easier mental calculation.
Choose and explain the most efficient mental strategy for a given calculation.
Verify the correctness of mental calculations using number properties and estimation.

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Strand: Number (Strand 1)
Sub-strand: Number Operations (1.2)
Content standard: B8.1.2.1 - Apply mental mathematics strategies and number properties used to solve problems
Indicator: B8.1.2.1.2 - Apply mental mathematics strategies and number properties to do calculation
Suggested placement: Term 1, Week 6 (Week 6 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. 94
Transcribed from the official NaCCA publication. Check this page against the source.

E.g. 1. Apply halving and doubling to determine the product given product of two given numbers.