chunking_-_2_chu_so_-_ba_duy_-_english_version.ppt

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<b>125 ÷ 25 = 5</b>

<b>125 – dividend</b>

<b>25 – divisor</b>

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<b>Chunking</b>

is an informal

method which is based on

our

<b>mental process </b>

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We

<b>keep subtracting</b>

<b>small JUNKS </b>

or

<b>MULTIPLES</b>

of

the

<b>divisor</b>

.

<b>125 ÷ 25 </b>

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WALT. Divide an interger by a 2-digit

divisor.

In order to carry out the chunking

division quickly, we need to

<b>mentally</b>

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168 ÷ 14 =
14 168

28

-

28

14 x 2

0
12

12

-

140

14 x 10

<b>Bội số của 14</b>

(Multiples of 14)

<b>We highlight the divisor 14 in order to find the </b>
<b>multiples of 14</b>

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416 ÷ 26 =
26 416

- 260 26 x 10

156

- 130 26 x 5

26
16

16

<b>We highlight the divisor 26 in order to find the </b>
<b>multiples of 26</b>

<b>We circle “the times” we </b>
<b>multiplied by 26.</b>

- 26 26 x 1

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825 ÷ 25 =
25 825

-

<b>500</b>

<b> 25 x 20</b>

325

-

250

25 x 10
75

33

33

- <b>50 25 x 2</b>

25

-

25 25

x 1

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2912 ÷ 34 =
34 2924

-

680

34 x 20

2244

- 680

34

x 20

1564
884

- 680

34 x 20

- 680

34 x 20

204

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2912 ÷ 34 =

34 ₂₉₂₄

- 3400

34 x 100



- 1700

34 x 50

÷ 2
÷ 2

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2912 ÷ 34 =
34 2924

- 1700

34

x 50

1224

- 680

34 x 20

544

86

204

- 340

34 x 10

- 170

34 x 5

34
86

- 34

34 x 1

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<b>Remember: </b>

<b>Should only use multiples of:</b>

•

<b>_{2, 4, 5, 10,}</b>

•

<b>_{20, 40, 50,}</b>

•

<b>_{100, 200,…}</b>

<b>In order to work out the chunks </b>

<b>quickly and to avoid careless </b>

<b>mistakes when subtracting </b>



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