Addition & Subtraction

Story Translators

Decide which way a story moves before you work out any numbers.

The Hopping Map

Add or subtract huge numbers by hopping one safe step at a time.

Number Smashers

Split by place value, then add the matching pieces or take the chunks away in stages.

The Column Stack

Carry and borrow your way through columns full of empty rooms.

The Missing Piece

Find a hidden number by asking whether the start or a part is missing.

The Rewind Button

Use the opposite operation to prove your answer is right.

Estimate & Check

4,812 + 3,197 ≈ 5,000 + 3,000 = 8,000.