Subtracting 1s or 10s (no regrouping)

The  exercise appears under the Early math Math Mission. This exercise has the Khan Academy user subtract a multiple of 10 or a single-digit number from a double-digit number.

Types of problems
There is one type of problem in this exercise:
 * 1) Subtract the numbers: This problem asks the user to subtract a multiple of 10 OR a single-digit number from a random double-digit number.  Subtracting1sor10sNR.png

Strategies
Basic knowledge of subtraction is required for this exercise.
 * 1) It's very easy to get both speed and accuracy badges in this exercise.

Real-life Applications

 * 1) Subtracting 1s or 10s is essential in everyday monetary transactions.