Multiplication triplets
Explore the pack: find two cards that multiply to make a third, then turn them over to see the colours. How many triplets can you make?
Before this, try: Multiples huntBuilding with colours
You need: A pack of Prime Colours cards.
Players: 1 or more
Goal: Find as many multiplication triplets as you can.
Steps
- Lay the cards out, number side up.
- Find a triplet: two cards that multiply to make a third card. For example 3 × 6 = 18.
- When you find one, turn all three cards over to show the colours.
- Can you find 10 triplets? More?
What do you notice?
- Look at the colours on each triplet. What do you notice about the third card?
- Are there any cards you can't make a multiplication for?
- What stops you making more triplets?
- How could you work out the largest number of triplets a pack can make?
Going further
Pick one colour, say every card with a blue disk, and sort the pack into cards that have it and cards that don't. What do the cards in each pile have in common? The Investigate the colours card below walks you through it.
Printables
Next activityOne disk change, one card change →Get the cards
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