About Big Sums
Here the numbers get bigger, such as 40 + 30 or 47 + 38. Your child adds and takes away in their head, thinking in tens and ones, then taps the answer. The oldest kids carry across tens and work with numbers into the hundreds.
How to play
- Work with the tens first, then the ones.
- Put both parts together and tap the answer.
- With a keyboard, press 1 for the first answer and 2 for the second.
What your child practices
- Adding two-digit numbers
- Taking away from 100
- Tens and ones
- Carrying and borrowing
How it grows with your child
YoungAges 6-8
Adding and taking away two-digit numbers without carrying, like 23 + 15.
Big KidsAges 8-11
Carrying, taking away from 100 and three-digit numbers, with four choices.
Play together
Add up two house numbers or bus numbers you see on a walk, tens first and then ones.
