En anglais

Speedy facts within 20

Mathématiques · Addition et soustraction · de 7 à 8 ans

Nom ______________________ Date ____________

What is 14 − 6?
- 7
- 8
- 9
What is 5 + 7?
- 12
- 11
- 13
- 10
Knowing 7 + 8 = 15 helps you know that 15 - 8 = 7.
En entourer un : Vrai Faux
What is 6 + 7?
- 13
- 12
- 14
What is 15 − 7?
- 8
- 7
- 9
What is 7 + 4?
Réponse : ______________
You know 7 + 9 = 16. What is 16 - 9?
- 6
- 7
- 8
- 9
What is 13 - 5?
Réponse : ______________
Zoe knows 6 + 8 = 14. She wants 14 − 8 fast. What should she do?
- Check a different double before solving the subtraction
- Recall 6 + 8 = 14, so 14 - 8 = 6
- Count back from 14 one step at a time
Sam takes 10 seconds and uses his fingers to solve 7 + 6. Is Sam showing fluency with this fact?
- Yes, because he got the correct answer even though he counted slowly
- Yes, a fact is fluent whenever the final answer is correct
- No, fluent recall is quick and does not use counting

Corrigé

Pour les adultes. Replier cette page avant de passer le reste.

8 · 14 − 6 = 8. Think: 6 + 8 = 14.
12 · 5 + 5 makes 10, and there are 2 more from the 7, so 10 + 2 = 12.
Vrai · The same three numbers make a fact family. Taking 8 from the whole 15 leaves the other part, 7.
13 · 6 + 7 is one less than 7 + 7 (14), so it is 13.
8 · 15 − 7 = 8. Think: 7 + 8 = 15.
11 · Use 7 + 3 = 10, then add the 1 left from 4. The answer is 11.
7 · The fact family has parts 7 and 9 and whole 16. Taking away 9 leaves 7.
8 · Take away 3 to reach 10, then take away 2 more. That leaves 8.
Recall 6 + 8 = 14, so 14 - 8 = 6 · Since 6 + 8 = 14, she can jump straight to 14 − 8 = 6 without counting.
No, fluent recall is quick and does not use counting · Getting the right answer is not enough. Fluency means fast recall, without needing to count.