The topic Add 2-digit numbers by making tens is a topic under the Early math Math Mission. This exercise practices some of the basic ideas of associativity to help with regrouping and finding sums.

Types of Problems

There is one type of problem in this exercise:

  1. Split the number to find the sum: This problem provides an initial addition problem that can be conveniently split up into a different sum. The problem guides the student through how to split a number to make it easier to calculate. The student is expected to provide the correct answer at each step and write it in the boxes.

    Split the number to find the sum


Knowledge of the associative properties can help, but are not necessary on this exercise.

  1. This exercise is very easy to attain both accuracy badges and speed badges as the numbers are small.
  2. The answers to the first two prompts will be the same number. The next slot will be a multiple of ten, and final slot is always the answer.

Real-life Applications

  1. Addition can be used for adding objects, like adding money totals.

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