Counting and number puzzles
Strategy card
Counting helps you see what changed.
- Step 1: Touch each dot and count.
- Step 2: Count the next group.
- Step 3: Did it get more or less? How many more?
- Step 4: Pick the group that changes the same way.
Tip: Touch each thing once as you count so you don't miss one.
Worked example
Find the rule. Which number goes with the last one?
40 → 50
15 → ?
- A: 30
- B: 21
- C: 25 (the answer)
- D: 28
Why: The rule is: add 10. 40 → 50. So 15 → 25.
Your turn
Your turn 1 of 3
Use every number and every sign once. Which answer can you make?
Numbers and signs: 9 3 3 + −
Your turn 2 of 3
Which number comes next?
28, 31, 34, 37, ?
Your turn 3 of 3
Find the rule. Which number goes with the last one?
17 → 26
20 → ?
Keep practicing
Grown-ups: Count stairs, grapes or cars together. Parent guide
Next lesson: Number patterns