Chunking in mathematics helps pupils to really understand the numbers they are adding as well as helping to develop strategies for mental maths.

Chunking means breaking larger numbers into smaller chunks, separating units, tens, hundreds etc., to make calculations easier.

For example:

45 can be chunked to 40 + 5

126 can be chunked to 100 + 20 + 6

1253 can be chunked to 1000 + 200 + 50 + 3

our sum is

53 + 26 =

this is the same as

50 + 3 + 20 + 6

add the tens together

50 + 20 = 70

add the units together

3 + 6 = 9

then add the answers together

70 + 9 = 79

our sum is

158 + 194 =

this is the same as

100 + 50 + 8 + 100 + 90 + 4

add the hundreds together

100 + 100 = 200

add the tens together

50 + 90 = 140

add the units together

8 + 4 = 12

add the answers together, using further chunking if necessary

200 + 140 + 12

200 + 100 + 40 + 10 + 2

200 + 100 = 300

40 + 10 = 50

2

300 + 50 + 2 = 352

so

158 + 194 = 352

Harvard Reference for this page:

Heather Y Wheeler. (2015). Adding by Chunking. Available: http://www.tiffanymacbeth.com/Maths/chunking_addition.htm. Last accessed

Place Value Adding Number Bonds Mental Addition Adding by Chunking Column Addition Subtracting Subtracting by Chunking Column Subtraction Mental Subtraction Roman Numerals

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