Our Lady Of Lourdes Catholic Primary School

We Learn with God as our Guide

Maths

Week beginning 7th October

This week we have been adding and subtracting tens from a two digit number. We have observed that the tens number in a two digit number changes when we add or subtract blocks of ten, but the ones number says the same.

 

Column addition and subtraction as a means of recording calculations has been introduced for the first time. We have practised different ways of calculating and recording how to add ones to a two digit number when crossing ten. We know that partitioning the ones can help us to 'make' (or round) to the next ten. It is then easy to add the remaining ones.  For example 37 + 7. Another 3 is needed to round to 40. 7 can be partitioned into 3 and 4. I have already added 3, so now my calculation is 40+4 =44. Skills like this rely on a very secure knowledge of number bonds to ten and within 20. 

Week beginning 30th September

We are continuing with the addition and subtraction topic.

This week the emphasis on being very familiar with addition and subtraction facts to 20. The children are learning ways to check calculations using concrete objects, drawings and inverse operations. Inverse operations are essentially the opposite of the original calculation. So for example, the inverse of 2 + 3 = 5 is 5 - 3 = 2 or 5 - 2 = 3.

We have then been looking ways to use our knowledge of number to see links between similar calculations. So the children can see that 6 + 2 is equal to 7 + 1 and that 10 - 2 is less than 10 - 1.

The children's knowledge of number bonds to 20 is then used to calcuate related facts to 100. So 4 + 5 = 9 and so we know that 40 + 50 = 90.

Week beginning 9th September

Our first topic this year is place value. This week we will be exploring partitioning numbers into tens and ones using part-whole diagrams and place value charts. We will also be comparing and ordering numbers using the terms and symbols for less than, greater than and equal to. The children will use base ten materials, counters, 100 squares and number lines and tracks to support their learning.

The number challenges also start this week and I will be giving them their logins for Times Table Rockstars. Please encourage them to practise. There is no real secret to learning number bonds or times tables; it is just a case of doing lots of practise.