Counting blocks
Build numbers from ones and tens, then regroup them.
Grades K–8 · Math
Math that clicks, one step at a time.
Lessons match your child's grade level, and the practice toolbox has blocks, number lines, and fraction bars they can move around.
Free · No ads · No in-app purchases
Grade 3 · RegroupingStep 2 of 4
Counting blocks
10 ones make 1 ten. Drag the ten ones over to the tens column.
Regrouped 10 ones into 1 ten
Hands-on tools
Kids learn math by moving things.
Each problem offers the tools that fit it. Kids drag, split, and count on screen.
Number line
Count on and jump back along a line that stretches to fit the numbers in the problem.
Fraction bar
Split a bar into parts, shade them, and compare two fractions side by side.
Algebra balance
Add and remove weights from both sides to solve for x.
Also inside · Long division pad · Column arithmetic pad · Ten-frame · Ratio tape · Drawing board · Note pad
How we teach
We say regrouping — not carrying or borrowing.
Ten ones become one ten. Kids watch that happen on screen and hear the same word for it that their teacher uses in class.
The rest of the wording follows the same rule: plain terms that describe what the numbers are doing.
- We say
- Regrouping
- Not
Carrying · Borrowing- Because
- 10 ones = 1 ten. The value stays the same. Only its name changes.
For parents and teachers
Built the way math is taught in class.
Grade-aligned
K through 8
Each grade's skills are matched to the Common Core math standards and Washington's state math standards for that grade.
Research-informed
Methods with named sources
When a lesson's method comes from research, such as the National Research Council or the What Works Clearinghouse, the lesson lists the source.
Safe by default
No ads, no chat, no noise
Nothing to buy inside the app and nobody for your child to message. You see their progress in the parent dashboard.
Start with one lesson tonight.
Free to use. Pick a grade, hand over the tablet, and see how your child does.
For parents and teachers