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Maths. Addition and Subtraction. Year One

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Year One

Maths | Addition and Subtraction | Add and Subtract Numbers Mentally | Lesson 1 of 8: Addition and Subtraction Facts within 20

Addition and Subtraction

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(3)

Success Criteria

Aim

Statement 1 Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Statement 2

• Sub statement

Aim

To recall addition and subtraction facts within 20.

I can recall addition number facts within 10.

I can recall addition number facts that bridge 10.

I can work out the related subtraction facts.

I can apply these facts to solve problems.

(4)

Total 10

Do not total 10

Recall the answers to these facts

and sort them into the table.

Try not to use your fingers - see

(5)

Total is Odd

Total is Even

Recall the answers to these facts

and sort them into the table.

(6)

Total is < 5

Total is > 5

Recall the answers to these facts

and sort them into the table.

(7)

These are the number facts

we should have at our

fingertips. We should know

the

answers

to

these

calculations

without

counting on, using our

fingers or a number line.

Knowing these facts will

make

other

calculating

speedier!

+ 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10

Goodness, that’s a lot of

facts! But I know some

things that can help me.

Can you make some

general statements?

When we add 0

to a number, the

number does not

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+ 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10

Fingertip Facts

+ 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10

That’s a few less to learn. I

know some other things

(9)

Which pairs of numbers add

together to make 10?

Odd:

1 + 2 =

3 + 2 =

5 + 2 =

7 + 2 =

9 + 2 =

What happens when we add

2 to a number?

Even:

2 + 2 =

4 + 2 =

6 + 2 =

8 + 2 =

10 + 2 =

0 + 10

1 + 9

2 + 8

3 + 7

4 + 6

5 + 5

10 + 0

9 + 1

8 + 2

7 + 3

6 + 4

even number

+ 2 = next even number

odd number

+ 2 = next odd number

Remember

addition can be done in any

order - it is commutative. So,

we know these facts the other

way round too.

(10)

+ 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10 + 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10

I know some

doubles. That will

help too!

Let’s add those facts

we know too…

(11)

What doubles do we know?

1 + 1 =

2 + 2 =

3 + 3 =

4 + 4 =

5 + 5 =

6 + 6 =

7 + 7 =

8 + 8 =

9 + 9 =

10 + 10 =

We can use these doubles to

help with near doubles.

2 + 3 =

3 + 4 =

4 + 5 =

5 + 6 =

6 + 7 =

7 + 8 =

8 + 9 =

For near doubles we recall our

double facts and add 1 more.

(12)

+ 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10 + 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10

Let’s think what else

we already know.

Let’s add those facts

we know too…

Can you make some

general statements?

(13)

+ 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10 + 0 1 2 3 4 5 6 7 8 9 10 0 0+0 0+1 0+2 0+3 0+4 0+5 0+6 0+7 0+8 0+9 0+10 1 1+0 1+1 1+2 1+3 1+4 1+5 1+6 1+7 1+8 1+9 1+10 2 2+0 2+1 2+2 2+3 2+4 2+5 2+6 2+7 2+8 2+9 2+10 3 3+0 3+1 3+2 3+3 3+4 3+5 3+6 3+7 3+8 3+9 3+10 4 4+0 4+1 4+2 4+3 4+4 4+5 4+6 4+7 4+8 4+9 4+10 5 5+0 5+1 5+2 5+3 5+4 5+5 5+6 5+7 5+8 5+9 5+10 6 6+0 6+1 6+2 6+3 6+4 6+5 6+6 6+7 6+8 6+9 6+10 7 7+0 7+1 7+2 7+3 7+4 7+5 7+6 7+7 7+8 7+9 7+10 8 8+0 8+1 8+2 8+3 8+4 8+5 8+6 8+7 8+8 8+9 8+10 9 9+0 9+1 9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9 9+10 10 10+0 10+1 10+2 10+3 10+4 10+5 10+6 10+7 10+8 10+9 10+10

Let’s look at

what’s left.

Let’s add those facts

we know too…

These are the facts left to learn.

Can you

think of any strategies

to make these easier to

remember? Share your ideas.

(14)

We know addition and

subtraction are inverses.

What does this mean?

Addition and subtraction

are opposites. One can

undo the other.

When we can

recall addition

facts instantly, we

(15)
(16)

How many of these addition

facts can you remember?

Challenge yourself to remember

them all in 5 minutes.

If you have time to spare,

start writing some related

subtraction facts on the second

half of the sheet.

(17)

Dive in by completing your own activity!

(18)

Success Criteria

Aim

Statement 1 Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Statement 2

• Sub statement

Aim

To recall addition and subtraction facts within 20.

I can recall addition number facts within 10.

I can recall addition number facts that bridge 10.

I can work out the related subtraction facts.

I can apply these facts to solve problems.

(19)

References

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