AC9M5N06 Year 5 Mathematics

This Content Descriptor from Year 5 Mathematics provides the specific knowledge and skills students should learn. Use it to plan lessons, create learning sequences, and design assessments that align with the Australian Curriculum v9.

solve problems involving multiplication of larger numbers by one- or two-digit numbers, choosing efficient calculation strategies and using digital tools where appropriate; check the reasonableness of answers

Elaborations

• 1 solving multiplication problems such as \(253 \times 4\) using a doubling strategy; for example, \(2 \times 253 = 506\) and \(2 \times 506 = 1012\)
• 2 solving multiplication problems like \(15 \times 16\) by thinking of factors of both numbers, \(15 = 3 \times 5, 16 = 2 \times 8\); rearranging the factors to make the calculation easier, \(5 \times 2 = 10, 3 \times 8 = 24\) and \(10 \times 24 = 240\)
• 3 using an array to show place value partitioning to solve multiplication, such as \(324 \times 8\), thinking \(300 \times 8 = 2400, 20 \times 8 = 160, 4 \times 8 = 32\) then adding the parts, \(2400 + 160 + 32 = 2592\) ; connecting the parts of the array to a standard written algorithm
• 4 using different strategies used to multiply numbers, explaining how they work and if they have any limitations; for example, discussing how the Japanese visual method for multiplication is not effective for multiplying larger numbers

Related Achievement Standards