Left-to-right addition from 1-digit pairs to 4-digit mastery. 30 progressive levels.
Why this matters
Splitting a restaurant bill, totalling a grocery cart, balancing an account - left-to-right addition is the everyday move you do most.
Levels Cleared
0%
Group 1
Count Down
Score 100 in 57s
1-digit + 1-digit
Reach Target
Reach 150 pts in 58s
2d + 1d (no carry)
Last Problems
Last for 18 problems
2d + 1d (with carry)
Last Time
Last for 43 seconds
Mixed 1d/2d + 1d
Beat The Clock
Get 12 correct in 57s
2d + 1d (sum < 100)
Group 2
Count Down
Score 115 in 54s
2d + 2d (no carry)
Reach Target
Reach 173 pts in 56s
2d + 2d (ones carry)
Last Problems
Last for 21 problems
2d + 2d (both carry)
Last Time
Last for 41 seconds
2d + 2d (any)
Beat The Clock
Get 14 correct in 54s
2d + 2d (mastery)
Group 3
Count Down
Score 130 in 51s
3d + 2d (no carry)
Reach Target
Reach 195 pts in 54s
3d + 2d (ones carry)
Last Problems
Last for 24 problems
3d + 2d (both carry)
Last Time
Last for 39 seconds
3d + 2d (any)
Beat The Clock
Get 16 correct in 51s
3d + 2d (mastery)
Group 4
Count Down
Score 145 in 48s
3d + 3d (no carry)
Reach Target
Reach 218 pts in 52s
3d + 3d (ones carry)
Last Problems
Last for 27 problems
3d + 3d (overflow)
Last Time
Last for 37 seconds
3d + 3d (any)
Beat The Clock
Get 18 correct in 48s
3d + 3d (mastery)
Group 5
Count Down
Score 160 in 45s
4d + 3d (no carry)
Reach Target
Reach 240 pts in 50s
4d + 3d (ones carry)
Last Problems
Last for 30 problems
4d + 3d (overflow)
Last Time
Last for 35 seconds
4d + 3d (any)
Beat The Clock
Get 20 correct in 45s
4d + 3d (mastery)
Group 6
Count Down
Score 175 in 42s
4d + 4d (no carry)
Reach Target
Reach 263 pts in 48s
4d + 4d (ones carry)
Last Problems
Last for 33 problems
4d + 4d (overflow)
Last Time
Last for 33 seconds
4d + 4d (any)
Beat The Clock
Get 22 correct in 42s
4d + 4d (mastery)