Learn a trick, then practice it solo or race a friend — built for the classroom and for home.
Multiply by 11
Keep the outer digits. The middle digit is their sum.
Squares Ending with 5
Multiply the leading digit by one more than itself, then write 25.
Squares Starting with 5
Add the units digit to 25, then write its square after.
Direct Sums
Add and subtract with beads you can move directly — no complements.
Solo Play
Choose how many questions to practice.
Division by 9
Add the digits for the remainder. The quotient builds left to right.
Multiply by 99, 999…
Subtract 1 from the number, then write the 9-complement of each digit.
2-Digit × 2-Digit
Left digits, cross-products added, then right digits.
Multiply by 101
Write the number, then add it again two places over.
Units Add to 10
Multiply the common part by one more than itself, then the units.
Tens Add to 10
Multiply the tens, add the units, then multiply the units.
5's Complement
Out of beads? Add 5, then take away the partner (+4 = +5 − 1).
Solo Play
Choose how many questions to practice.
10's Complement
Add 10 on the next rod, then take away the partner (+8 = +10 − 2).
Solo Play
Choose how many questions to practice.
Math Jigsaw
Fit each answer piece onto its sum to build the hidden picture.
Group
Set up your 2-player match.

