Division as Unknown Factor
Understand division as an unknown-factor problem (e.g. find 32 ÷ 8 by finding the number that makes 32 when multiplied by 8)
Ce que l'enfant saura faire ensuite
- Explain that 32 ÷ 8 = ? is the same as 8 × ? = 32
- Use a known multiplication fact to find a division answer
- Describe the relationship between multiplication and division as inverse operations
1 · Lis
You already know multiplication and division are connected. When you see 32 ÷ 8, you can turn it into a multiplication question instead: what number times 8 gives 32?
Zara needs to solve 32 ÷ 8. Instead of guessing, she thinks of her times tables: 8 × 4 = 32. So the missing number is 4, and 32 ÷ 8 = 4.
Multiplication and division are inverse operations: each one undoes the other. 5 × 4 = 20, and 20 ÷ 5 takes you back to 4. So you can turn any division into a multiplication with a missing number. 20 ÷ 5 becomes 5 × ? = 20. Then use a times table fact you know to fill the gap.
Division finds the missing factor: turn ÷ into × with a blank, then use your times tables to fill it in.
Readings 'Every division has a multiplication partner', 'Sharing or grouping' and 'Splitting a big division' are original to this dataset. All 9 extra questions are original to this dataset.
2 · Regarde
En anglaisSans écran
Où se situe ce sujet
17 questions attendent derrière cette leçon, chacune avec sa réponse expliquée. Chaque réponse nourrit le ciel : les étoiles s'allument à mesure qu'elles sont apprises, et pâlissent quand vient le moment de revenir.