Estimate, Calculate, Check!

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This week in maths we have been looking at addition and subtraction using Dienes. We have used Dienes before and so were comfortable working with them.  We have looked at a new way of checking our work by looking at factor families, estimation and looking at the inverse.

118 + 347

 We made sure that we first made an ESTIMATION.                       120 + 350 = 470

We then used the Dienes to CALCULATE the answer.                       118 + 347 = 465

We then used the inverse to CHECK our answer.                            465 – 118 = 347

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