Purpose

In this activity the purpose is to find out how many tens and ones blocks are hidden from a given total.

Achievement Objectives

NA2-3: Know the basic addition and subtraction facts.

NA2-4: Know how many ones, tens, and hundreds are in whole numbers to at least 1000.

Specific Learning Outcomes

Solve subtraction problems

Required Resource Materials

Place value blocks, tens and ones

Overhead Projector

Blackboard or whiteboard

Activity

- Show the students you have put blocks on the OHP to represent a number but some of them are hiding (covered). Ask them to work out how many are hiding.
*All my blocks together show 78, but some of them are hiding.**How many are hiding?* - After a time for thinking, have students share their answers and their thinking, recording some of these on the board.
- Uncover the hiding blocks, and count them to show students both the number hiding and the total number.
- Repeat the activity with a different number of blocks hidden.

Printed from https://nzmaths.co.nz/resource/something-s-hiding at 12:44pm on the 27th October 2021