Year 3 Maths

Spring term
Block A
Lesson 5

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Summer term
Autumn term
 

 

 


How to add 2-digit numbers together mentally

To add two, 2-digit numbers together mentally you can either partition the numbers by adding the tens and the the units together, then badd the totals of the tens and units together to get a final total.

Example 12 + 32

Partitions mentally to (10 + 30 = 40) and (2 + 2 = 4)

Add partition totals together 40 + 4 = 44

Practice checking your answers in a notebook.

 

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Addition-

 

 

 

 

 

 

Add or subtract these 2-digit numbers
using mental partitioning
 

a)

=

b)

=

c)

=

d)

=

e)

=