Concentration (constant difference)

A thinking mathematically context for practise, focussed on identifying related subtraction equations with a constant difference

Syllabus

Syllabus outcomes and content descriptors from Mathematics K–10 Syllabus © NSW Education Standards Authority (NESA) for and on behalf of the Crown in right of the State of New South Wales, 2023

Outcomes

Stage 1

MAO-WM-01
MA1-CSQ-01

Collect resources

You will need Constant difference cards (PDF 1.1 MB)

Instructions

To set up a game of concentration (also known as memory or pairs), first shuffle the cards well and then place each card face down.
Each player takes a turn by turning two cards over.
If the cards match, then the player picks up the cards and keeps them.
If they don't match, the player turns the cards back over.
You can also play by yourself.

Let's talk – number talk (23 minus 19)

Stage 1 – A thinking mathematically targeted teaching opportunity focussed on different ways to think about 23 - 19

Let's investigate 1 – number talk (exploring constant difference)

Stage 1 and 2 – A thinking mathematically targeted teaching opportunity focussed on investigating one of the strategies to solve 230 - 190