# Numeracy

Number Facts MAY

Week 3 (w/c 4/5/20): Subtracting a single digit from a 20s number bridging 20 (Main Group)

This forms the basis of our class learning and our number facts for this week (see above)

Please complete pages 21 and 22 of NHM Booklet Addition and Subtraction to 100

Week 3 (w/c 4/5/20): Taking 10 from a multiple 0f 10 (Small Group)
Week 3 Symmetry (Both Groups)

Please complete symmetry pages 6 and 7 from NHM Booklet Shape, Measure and Data Handling.

I have put quite a few symmetry resources here from twinkl...please don't feel obliged to do them all. Have a chat with your P3 to see which would be more appropriate to his/her ability/interest level.

Week 4 (w/c 11/5) Finding a Small Difference by Counting On (Both Groups)

This is a very useful clip to watch (for parents/carers) before beginning this week's subtraction activities.

This is a useful clip to show your P3 when beginning to practise the counting on strategy for finding a small difference (both groups).

Here are some introductory activities to complete before beginning independent work.
Please complete Page 25 of NHM booklet 'Addition and Subtraction to 100' (both groups).
Check up 13 can now be done (Main Group)
This resource (for the small group) is in two formats.....your P3 might want to type answers into the word document on-screen?This links subtraction and addition (as inverse operations). The number line is there to help. They could begin by using the number line and then doing it again independently.
An extension page using some 3-digit numbers....for the very brave! Again it's in two formats if any P3s want to type on-screen!

Week 4 - Measuring in centimetres (both groups)

Please complete page 11 in NHM Booklet 'Shape, Measure and Data Handling'. Children have to estimate and then measure in centimetres. For children, the biggest obstacle to measuring correctly is placement of the ruler. You will be amazed and amused at all the different ways children can get this wrong!

### Week 5 (w/c 18/5/20)

To start week 5 we will be practising subtracting 10. We do this practically by looking at tens and ones. To subtract ten from any 2-digit number we take away 'a ten stick'. As a substitute for ten sticks and cubes you can use 10p and 1p coins. The most important thing for your P3 to notice is that when 10 is taken away the 'ones' stay the same and the tens decrease by 1

## 14 May 2020

Subtracting 10 from a 2-digit number

## Subtracting 10 from a 2-digit number

Once you've watched these clips please have a go for yourselves using 10p and 1p coins and/or using your own improvised ten sticks and ones.

The following PDF is a fun game to help practise subtracting 10.

It is also useful to have a look at the 100 square when subtracting ten. This next link shows exactly that. Children learn that instead of counting backwards 10 times a move upwards on the 100 square takes away 10.

### Small Group (-10 practice)

Small Group can complete page 18 of NHM Booklet Addition and Subtraction to 100

### Main Group - Subtracting 9 and 11

Once your P3 has had lots of practise taking away 10 and he/she is confident with that you could move on to taking away 9 or 11. We rely heavily on our knowledge of subtracting 10 for this so only attempt this if you feel your P3 has a good working knowledge of minus 10.
On page 26 of NHM Addition and Subtraction to 100 there are certain questions which practise subtraction of 9 and 11. Only do the questions your P3 feels comfortable with.

### Venn Diagrams - Both Groups

Venn Diagrams can be revised (if necessary!) this week. There is a Powerpoint and a nice dinosaur sorting activity which ties in well with dinosaur diets. These activities are for both groups.

### Week 6 (w/c 25/5/20)

This week the 'Main Group' will be beginning to look at subtracting a 2-digit number from another 2-digit number. Like most of the subtraction this month this might prove difficult. With lots of practise, initially using concrete materials or the 100 square, P3s should eventually feel more comfortable with this. Please don't panic if your P3 is struggling with this.....it's really hard! They will practise this the whole way through school so there's no need to be an expert just yet. The ones (units digit) that we take away this week will ALWAYS be smaller than the one we take from. It's important to mention that in P3 we don't start 'column/vertical subtraction'. In P3 we practise using tens and units and doing subtraction mentally/horizontally.

This week the 'Small Group' will be subtracting a multiple of 10 from another multiple of 10. This builds on the work done in week 3 when they were subtracting 10 from a multiple of ten. Obviously this also links to subtraction of single digits. For example they know that 5-2=3 and so it follows that 50-20=30 (or 5 tens minus 2 tens equals 3 tens.)

### Main Group

To begin the week it is helpful to revise subtracting a 'tens number' (10,20,30 etc.) from a 2-digit number. Remember that when taking away tens the ones (units) stay the same. Focus on the tens column and take away tens, one at a time:

eg. 56 - 20=

56 -10 -10=

eg. 72 - 30 =

72 - 10 - 10 - 10 =

In place of ten sticks and ones, please improvise with whatever you have.....eg pens for 10 sticks and cheerios for ones!

Please also have a good look at the 100 square. Carol Vorderman does a good lesson on taking away multiples of 10 on Maths Factor (your P3s each have their own login for this - it's the same as bugclub). I'll post the link below. There's a quick explanation from Carol and then a warm up and some written questions.

When your P3 is ready you can try taking away any 2-digit number from another. Take away the ones/units first and then the tens. Use your tens and ones or your 100 square(counting backwards to take the ones off and then counting vertically up to take off the tens) at first then eventually move to the written method, doing the calculations mentally. For example:

63 - 21 =

63 - 1 - 10 - 10 =

75 - 33 =

75 - 3 - 10 - 10 - 10 =

Please complete pages 27 and 28 in NHM Booklet Addition and Subtraction to 100.

If you are able, please have a look at the work I have set on the Abacus Maths section of your Bugclub profile. It links in nicely with this area of Maths.

### Small Group

The best way to begin is to use 10p coins to demonstrate taking away 10s from a tens number. Eg Using 10p coins:

50p (5 tens) - 30p (3 tens) = 20p (2 tens)

Repeated practice of this will reinforce the link between tens subtraction and their knowledge of single digit subtraction.

Another visual way of learning this by looking at the 100 square. Have a look at the next clip which shows Carol Vorderman using the 100 square to take away ten.
Use the link below for practice taking tens numbers on our 'Splat Square'. We use this often in class on the interactive whiteboard.
Below is a PDF of teachers' notes for this topic. You can use the ideas on this page to check understanding.
Please have a go at page 19 of NHM Booklet Addition and Subtraction to 100.

### Weight (Both Groups)

Please have a go at home at estimating and weighing either using your kitchen or bathroom scales. We are only working in whole and half kilograms so they can find their own and other family members' weights on the bathroom scales. Please complete pages 13 and 14 of NHM Shape, Measure and Data Handling.
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