En anglais

Adding and subtracting hundreds in your head

Mathématiques · Addition et soustraction · de 7 à 8 ans

Nom ______________________ Date ____________

What is 762 − 400?
Réponse : ______________
What is 345 + 200?
- 547
- 365
- 545
- 445
What is 345 + 200?
- 345
- 365
- 545
In 762 - 400 = 362, only the hundreds digit changed.
En entourer un : Vrai Faux
What is 625 + 200?
Réponse : ______________
Which number equals 483 - 200?
- 283
- 463
- 481
What is 458 + 300?
- 788
- 488
- 658
- 758
Hana says 762 − 400 = 772. Is Hana right?
En entourer un : Vrai Faux
Leo says 372 + 400 = 472. What mistake did he make?
- He replaced the hundreds digit instead of adding it
- He added 4 to the ones digit
- He forgot to add anything
What is 200 more than 750?
Réponse : ______________

Corrigé

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362 · Taking 400 shrinks the 7 hundreds to 3 hundreds, giving 362.
545 · Adding 200 grows the 3 hundreds to 5 hundreds, giving 545.
545 · Only the hundreds digit changes: 3 + 2 = 5, so 345 becomes 545. The 4 and 5 stay the same.
Vrai · The 6 and 2 stayed the same digits. Only the 7 became a 3.
825 · Adding 200 grows the 6 hundreds to 8 hundreds, giving 825.
283 · 4 hundreds - 2 hundreds = 2 hundreds. The 8 and 3 stay put, so 483 - 200 = 283.
758 · Adding 300 grows the 4 hundreds to 7 hundreds, giving 758.
Faux · Hana is wrong. Taking 400 shrinks the total to 362, not 772.
He replaced the hundreds digit instead of adding it · 372 + 400 means 3 hundreds plus 4 more hundreds, which makes 7 hundreds: 772. Leo swapped in the 4 instead of adding it to the 3.
950 · Adding 200 grows the 7 hundreds to 9 hundreds, giving 950.