60,000
25,000
1,500
13,000
400

Mental Math
Virtual Lab

Explore numbers, build combinations, discover patterns, and strengthen your mental math skills.

How to Use the Lab

1
Number Blocks — You are given number blocks. Each block can be used multiple times!
2
Click to Add — Select a target, then click blocks to add them to your equation.
3
Build the Target — Combine blocks until your total matches the target number.
4
Multiple Answers — There can be more than one correct combination. Explore!
5
Operators — Some activities allow both + and −. Use them creatively.
6
Impossible Targets — Some targets cannot be made! Click "I think it's impossible" if you believe so.
7
Hints — Stuck? Use the Hint button for progressive clues. No penalty for trying!

Choose an Activity

Pick an activity to start exploring numbers

Number Builder

Combine blocks to build target numbers

Can You Make It?

Discover which numbers are possible

Add & Subtract

Use both operations to reach targets

Challenge Builder

Create any valid equation

Digits & Operations

Explore digit patterns and sums

Always, Sometimes, Never

Test mathematical statements

Number Builder

Select a target, then click blocks to build it

Your Equation

Total: 0

Can You Make It?

Try to build the target — or discover why it might be impossible

Target Number

1,000

Your Combination

Total: 0

Addition & Subtraction Builder

Use both + and − to reach the target

Target

39,800

Number Blocks

Operators

Your Equation

Total: 0

Challenge Builder

Create any valid equation to match the target

Target

45,000

Number Blocks

Operators

Your Equation

Total: 0

Digits & Operations

Explore digit patterns and number properties

CHALLENGE

Always, Sometimes, or Never?

Think, explore and find out if each statement is always, sometimes, or never true