Equations for 15

 We've been representing equations with Cuisenaire rods in Y4.

Starting with this representation, we found lots of ways of describing it with equations. We then went on finding lots of equations involving fifteen.

 

 

10 + 5 = 15, 9 + 6 = 15, (4 x 2)+7 = 15 ...

18 - 3 = 15

1 + 2 +3 + 4 + 5 = 15

 

4 + 4 + 7 = 15, 4 + 9 + 2 = 15, 10 + 2 + 3 = 15...

 

 

7.5 x 2 = 15
Tibo
For this one, as there's not "half" rod, we decided the orange rod would be 5 and the yellow would be 2.5.

30 x 0.5 = 15
Killian
For this one, again, as there's no "half" rod, we decided the orange rod would be 5 and the white rod would be 0.5.