Achievement Objectives

NA1-1: Use a range of counting, grouping, and equal-sharing strategies with whole numbers and fractions.

Student Activity

Sam likes counting toes.

How many people does he need before he can count 50 different toes?

Specific Learning Outcomes

Count in 10's to 50

Devise and use problem solving strategies (act it out, draw a picture)

Description of Mathematics

This problem involves counting by 10s. As our number system is based on groups of ten, counting in 10's is an important skill.

Required Resource Materials

Activity

### Problem

Sam likes counting toes. How many people does he need before he can count 50 different toes?

### Teaching sequence

- Get the students to guess the subject of the problem by giving clues:
*you have 10 of these, you often can't see them...* - Read the problem to the class.
- Discuss ways that the problem could be solved. Remember to allow time for the students to
**think**before getting ideas from the class. If the students have had experience in solving problems you may choose not to share ideas at this point. - Reinforce the counting in 10's as you circulate while the students work on the problem. Ask the students to show you how they are keeping track of their counting in 10's.
- Share solutions.

#### Other contexts for the problem

How many 10c coins to get 50 cents?

### Solution

5 (10..20..30..40..50)

#### Extension to the Problem:

This activity could be extended to skip counting in 5s. (5..10..15..20..25..30..35..40..45..50)

Attachments

50Toes.pdf143.2 KB

KiaHiaNgaPahiPaku.pdf188.74 KB