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.

Achievement Objectives

NA1-3: Know groupings with five, within ten, and with ten.

Specific Learning Outcomes

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

Required Resource Materials

Calculators

Activity

- 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”.
- 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?* - Once students have given their answers, show them that the answer from the calculator is 18.
- 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.

#### Additional Activity

This activity can be repeated in a similar way to help learn groupings with 5.