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Doubles and Halves

Doubles and Halves

Understand Learn Practise Know

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Understand:

Doubles

To double something means add another the same so there is two.

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2 + 2 = 4

It is like adding a number to itself.

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7

+ 7

= 14

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Understand:

Now double these pictures and write the total of items.

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picture

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Double it

(copy it)

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Total?

(sum)

You can count them

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To Learn these: Read aloud or Write these out or ‘Do’ while reading.

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Practise: How quickly can you answer these?

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double

0

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double

1

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double

2

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double

3

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double

4

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double

5

10

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Practise - Again: Now this time out of order!

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Compare the sums to the addends,what do you notice?

Half of the sum, (eg ½ of 10) equals ONE of the addends (5)

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addends

sum

2 + 2

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4 + 4

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0 + 0

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5 + 5

10

3 + 3

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1 + 1

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Understand: Halves to 10

In words pictures numbers pictures

Half of two is one ½ of 2 = 1

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Half of four is two ½ of 4 = 2

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Half of 6 is 3 ½ of 6 = 3

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Half is opposite to doubles. 5 + 5 = 10 ½ of 10 = 5

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Learn: Read aloud or Write these out or ‘Do’ while reading.

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½ of 2 is 1

½ of 4 is 2

½ of 6 is 3

½ of 8 is 4

½ of 10 is 5

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Practise: How quickly can you answer these?

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half of

0

0

half of

2

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half of

4

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half of

6

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half of

8

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half of

10

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Practise: Again: Now this time out of order!

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half of

10

0

half of

6

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half of

4

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half of

2

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half of

8

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half of

0

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Learn: The Rest to 20!

You can Read aloud or Write these out or ‘Do’ while reading.

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The Rest to 20 Practise: How quickly can you answer these?

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Look at your answers, if you halve them (½) they equal the addend.

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addend

sum

double

6

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double

7

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double

8

16

double

9

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double

10

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double

0

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Learn: Here is a RAP to help you learn them all!

Put your earphones on first PLEASE 😃

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Practise - Again: Now this time out of order!

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8 + 8

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10 + 10

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0 + 0

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6 + 6

12

9 + 9

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7 + 7

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Learn All of them, GO!

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KNOW: How well do you know the Doubles Facts now?

Now you have spent time learning your doubles try this game:

Archery Doubles

Instructions:

Look at problem

And solve the double then click on the answer on the target:

Start on Level 1

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Understand: Halves to 20

In words pictures numbers

Half of twelve is six ½ of 12 = 6

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Half of fourteen is seven ½ of 14 = 7

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½ of 6 = 3

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Half is opposite to doubles. 10 + 10 = 20 ½ of 20 = 10

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Learn: Read aloud or Write these out or ‘Do’ while reading.

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Practise: How quickly can you answer these?

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half of

10

5

half of

12

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half of

14

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half of

16

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half of

18

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half of

20

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Practise: Again: Now this time out of order!

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half of

20

half of

16

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half of

14

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half of

12

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half of

18

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half of

10

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Know- How well do you know them? Are you ready for a test?

You have 3 choices:

  1. Go to Prototec , choose Stage 4 and see how fast you can do the Doubles and Halves section.
  2. Get a paper test off the teacher
  3. Find a classmate who knows them and challenge them to a game of Double the Dice or Double the Card or Halve the Dice or Halve the Number. Ask a buddy or the teacher if you cannot remember how to play.