Addition facts
Combine two quantities and practice making ten before moving into written addition. For 8 + 5, split 5 into 2 and 3: 8 + 2 makes 10, then 3 more makes 13. Check by subtracting one addend from the total.
Choose a skill to practice
Choose a link below to open the game, then press Start to begin the selected skill. Your practice round uses the same feedback and local progress storage as the main game.
- Number bonds to 10
- One-digit addition
- Addition with carrying
- Calculate with three numbers
- 2-digit + 1-digit
- Two-digit column addition
- Column addition with carrying
- Addition beyond 100
- Three-digit addition
- Four-digit addition
Use addition to combine and complete
A basket has 8 apples and receives 5 more. One way to find the total is to move 2 of the new apples into the first group: 8 + 2 + 3 = 13. The same relationship solves a missing-addend question such as 8 + ? = 13. Before using larger numbers, ask the learner to show both versions with counters. This connects recalling a fact to understanding the quantity it describes.
Common errors: losing a ten
In 28 + 17, the ones total 15. Write 5 ones and carry 1 ten; the tens are then 2 + 1 + 1 = 4, giving 45. A frequent error is to write the 5 but forget the carried ten. Another is to align numbers by their left edges rather than their place values. Estimate first: a number near 30 plus a number near 20 should be near 50, so 35 deserves another look.
From early facts to written addition
Begin with one-digit addition without carrying, then making ten and crossing ten. Grade 2 adds written two-digit calculations, while Grade 3 expands to hundreds and thousands. Decimal addition appears in the later skill groups and relies on the same place-value idea. If a written sum is difficult, identify whether the missing step is a basic fact or the carrying procedure; those call for different practice choices.