Something's Hiding!
In this activity the purpose is to find out how many tens and ones blocks are hidden from a given total.
solve subtraction problems
- 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.
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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.
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