∑
π
∞
+
+
+
+
f(x) = x²
∫ dx
√(n)
x
y
z
-3
-2
0
2
3
▲
■
⬢
⬤
⬥
1/2
1/3
3/4
Interactive · Mental Math · Abacus
Abacus Trainer
Build numbers bead by bead on the abacus, then check your answer. Sharpen your number sense and climb your best streak.
0
Score
0
Streak
0
Best Streak
2
Digits
Tip: press Enter to check your answer. Beads moved to the left add their rod's value.
