# Calculator Plus Ten

Purpose

The purpose of this activity is to help students learn groupings with 10. For example 10 and 2 make 12; 10 and 3 make 13.

Specific Learning Outcomes

Recall groupings with 10, for example 10 and 2 make 12; 10 and 3 make 13.

Required Resource Materials
Calculators
Activity
1. Show the students how to make the calculator show “plus ten”. Do this by pressing the keys: “+ 10 =” . Then, when any number is entered, followed by the equals key, the calculator will display 10 more than the number entered. For example, if “5 =” is entered, the calculator will display “15”.
2. Enter the number “8” into the calculator and say:
We have put the number 8 into the calculator. When we press the “=” key it will show us 8 plus 10. What will that be?
3. Once students have given their answers, show them that the answer from the calculator is 18.
4. Continue as a whole group in this way, or have students work in pairs with one student entering the numbers into the calculator and the other identifying the “plus ten” fact.

Note: using single digit numbers will help students learn groupings with ten, or the “teen” numbers. Larger numbers can be entered into the calculator once students are confident with these.