Maple Class subtraction stars! 18.10.16.

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Maple Class welcomed the challenge of trying to solve some subtraction problems today in our numeracy session. Avoiding the easier, more boring route, we decided to embrace our new interesting challenges! 

Armed with bead strings, we worked systematically to solve the subtraction problems. Sliding the beads across the string, we ‘took away’ and ‘subtracted’ from 10.

What did you notice? Explain the pattern we spotted to someone in your family.

10 – 0 = 10

10 – 1 = 9

10 – 2 = 8

10 – 3 = 7

10 – 4 = 6

10 – 5 = 5

10 – 6 = 4

10 – 7 = 3

10 – 8 = 2

10 – 9 = 1

10 – 10 = 0

To make things even more interesting, some of us then started to look at what happens when we ‘take away’ and ‘subtract’ from 20 in the same systematic method.

What will the next number sentences look like? How can you prove you know this?

20 – 0 = 20

20 – 1 = 19

20 – 2 = 18

20 – 3 = 17

20 – ? = ?

20 – ? = ?

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