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.
Solo practice
Round 1 of 8 · Score 0
Nice work!
You got 7 of 8 right.
Squares Ending with 5
Multiply the leading digit by one more than itself, then write 25.
Solo practice
Round 1 of 8 · Score 0
Nice work!
You got 7 of 8 right.
Squares Starting with 5
Add the units digit to 25, then write its square after.
Solo practice
Round 1 of 8 · Score 0
Nice work!
You got 7 of 8 right.
Abacus Practice
Quick addition and subtraction — just like your abacus sheets.
Solo Play
Choose how many questions to practice.
How many questions?
Solo practice
Round 1 of 10 · Score 0
Nice work!
You got 9 of 10 right.
Group
Set up your 2-player match.
First to how many correct answers wins?
Group
Team Navy
Team Orange
🎉
Team Navy wins!
Pulled the rope all the way.
