Regrouping when adding one-digit numbers

The  exercise appears under the Early math Math Mission. This exercise has the Khan Academy user add a single digit number to a double digit number using regrouping (or carrying).

Types of problems
There is one type of problem in this exercise:
 * 1) Regroup to add: This type of problem gives a two-digit number and a one-digit number and has the user add them using regrouping (AKA carrying). RegroupingWhenAddingOneDigitNumbers.png

Strategies
Basic knowledge of addition and regrouping is required for this exercise.
 * 1) It's easy to get accuracy badges in this exercise, especially given that most computers have builtin calculators.

Real-life Applications
These types of more complicated addition are likely to come up more often in the real world.
 * 1) Money usually deals with adding and subtracting 1-3 digit numbers