Mon Prof Augmenté
Complements to 100
Age 9 · Maths
Two amounts are complements to 100 when they fit together to fill a hundred-square exactly. If one amount is 65, the other must be 35.
This picture is part of the full library
Every lesson is open to everyone for 7 days after it is published. This one came out on October 2, 2026: its text stays readable here, and its picture opens with a subscription.
The app is free. A subscription opens every lesson, in every school year.
Age 9: open this week
Browse Age 9
Examples
- 65 blue squares and 35 orange squares fill a 10 by 10 grid.
- If you have 80 stickers, you need 20 more to make 100.
Key takeaways
- 65 + 35 = 100, so 35 is the complement of 65.
- The two parts always add up to 100.
Quiz: Complements to 100 (Age 9)
-
What does it mean when two amounts are complements to 100?
-
If one amount is 65, what is its complement to 100?
-
Which pair of amounts are complements to 100?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
Free app, optional subscription
App Store Google Play
Carry on in the app
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
Your child’s teacher does not use My Enhanced Teacher yet?
Tell them about it
