Classroom guide: using a numbers round

Try a round in three steps

1. Set the puzzle. Choose a pace and number mix. The target range and number of large cards can be adjusted in advanced settings.
2. Give thinking time. Display the numbers in classroom view. Learners can work mentally, on paper, or with a partner.
3. Compare routes. Invite someone to explain a method, check the expression, then reveal a hint or solution if the class needs one.

A small worked example

Use 25, 50, 4, 3, 2, 1 to reach 103.

25 × 4 = 100, then 100 + 3 = 103. The route uses each chosen card once and keeps each result whole.

Ask learners to find another route, or to see whether the target can be made with fewer cards.

Adjust the challenge

• For a gentler start, choose the Gentle pace and a smaller target range.
• For more stretch, use Challenge or adjust the number mix and target range.
• Leave the timer off when the aim is to explain a method. Use it when a short timed round suits the group.

Settings are optional. A new puzzle can be generated whenever you want a different example.

Questions to ask after the round

• Which two numbers did you combine first, and why?
• Can you find a different route to the same target?
• Can you reach it with fewer cards or fewer steps?
• How did you decide which operation to try next?