Maths – Thursday 14th May


Mental maths –  Try and do these in your head. 
8 + 7 + 2 =

20 - 9 =

27 + 8 =

19  + 4 + 8=

68  - 6 =

30 - 9 =

6  X 4 =

28  ÷ 4 =

Subtracting multiples of 10

Look at these examples:
 
Can you show how you would do these? 
1.       360 - 70=
2.       450 - 80=
3.       210 - 30=
4.       230-  40=
5.       401 - 50=
6.       823 - 40=
7.       666 - 60=
8.       651 – 60 =

Now can you subtract 90 by subtracting 100 and then adding 10?
E.G. 132 - 90 =
132 – 100 = 32
   32 + 10 = 42

1.       569 -  90 =
2.       777 -  90 =
3.       123 -  90 =
4.       453-  90 =
5.       865 -  90 =
6.       432 -  90 =
7.       198 -  90 =
8.       611 -  90 =

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