Make ten, then add
KS1 · 25 minutes · Add within twenty by partitioning one number to make ten.
Answer by: Type. You can change method or take a break at any time.
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Our learning goal
Add within twenty by partitioning one number to make ten.
Your turn: Choose one thing you would like to understand by the end.
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My lesson notes & project
Full teaching script
- Today: Make ten, then add. Our goal: Add within twenty by partitioning one number to make ten.
- Take one idea at a time. Pause after each sentence; ask for repetition whenever you need it.
- Ten is a useful stopping point. To calculate 8 + 5, start with eight counters. Eight needs two more to make ten. Split the five into two and three: 5 = 2 + 3. Move two counters to the eight, making ten, then add the remaining three. So 8 + 5 = 8 + 2 + 3 = 13. This changes the grouping, not the total. Check by counting all thirteen counters once. Another example is 9 + 7: nine needs one, so split seven into one and six. Ten plus six equals sixteen. A common mistake is adding the whole seven after making ten; that counts the first counter twice. Keep the unused counters separate.
- Together: choose one example from the explanation and show how it works. What do you notice?
- Your turn: Warm-up: find pairs making ten. Model 8 + 5 with counters. Guided practice: work out 7 + 6 together. Independent practice: calculate 9 + 4, 8 + 7 and 6 + 5, showing each split. Explain one method aloud or with a drawing.
- Reflect: what made sense, and what would you like explained differently?
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