Knaph
Explore

Subtraction

Subtracting takes some away to find how many are left, or finds how far apart two numbers are - the difference. It undoes adding, and unlike adding, the order matters: 7 - 3 is 4, but 3 - 7 is -4.

Depth 1 · Foundation

You can subtract by counting back or counting up, use it for 'how many are left' and 'how far apart', check it by adding, and know the order matters.

Sign in to prove what you know with a short quiz, see how deep you've gone, and earn XP for it.

Sign in with Google

Depths of understanding

  1. 1

    Foundation

    You can subtract by counting back or counting up, use it for 'how many are left' and 'how far apart', check it by adding, and know the order matters.

    Opens after

    AdditionSubtracting undoes adding: 7 + 5 = 12 means 12 - 5 = 7.IntegersTaking away more than you have goes past zero, to a negative number.

Your path here

What's still between you and Subtraction, depth 1, in the order you can learn it.

  1. 1CountingDepth 1 · Foundation · Number Systems
  2. 2Natural numbersDepth 1 · Foundation · Number Systems
  3. 3ZeroDepth 1 · Foundation · Number Systems
  4. 4The number lineDepth 1 · Foundation · Number Systems
  5. 5AdditionDepth 1 · Foundation · Arithmetic
  6. 6NumeralsDepth 1 · Foundation · Number Systems
  7. 7Place valueDepth 1 · Foundation · Number Systems
  8. 8Comparing numbersDepth 1 · Foundation · Number Systems
  9. 9IntegersDepth 1 · Foundation · Number Systems
  10. 10SubtractionDepth 1 · Foundation · Arithmetic

Builds on

Opens up