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- Use decimal notation
& place value
- Order decimals in different contexts
- Extend mental methods of + & - to include
decimals
- Consolidate written methods of + & - for whole
numbers, extend to decimals
- Judge whether an answer is reasonable
- Solve word problems &
investigate in a range of contexts: L, P & A |
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value
place value
tenth
hundredth
thousandth
decimal number
most significant digit
zero place holder
sign change key |
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ADDING DECIMALS
Ordering activity with cards with decimals, up to
3dp
OR
Ordering
Decimals
AND THEN
Using a number line, count on in steps of 0.1, 0.2
...1.5, (recap partitioning)
OR
Addition
of Decimals |
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Activity
Suggestions:
ADDING DECIMALS
In Pairs(with
individual number lines): OHS
N1/2: It's in the Box
use partitioning to mentally add on decimals, most
significant figure first
(estimating before calculating)
Whole Class: Recap written methods for column
+, extend to decimals ... decimal point as an indicator
(estimating before calculating)
Individual: written
activity on addition, eg: using pairs from 'It's
in the Box' |
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| Review learning,
using Place Value chart, eg: by mentally adding
pairs |
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SUBTRACTING DECIMALS
Use number line, counting back in steps of 0.1,
0.2 ...1.5 |
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Use number line
to count back in steps of 0.1, 0.2, ... 1.5
& discuss mental methods used.
Explain how to use place value to work out a subtraction
snake
Subtraction
of Decimals |
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SUBTRACTING DECIMALS
as above with subtraction
÷ |
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| Review learning,
using Subtraction Snake |
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| Pupils to use small
whiteboards to record answers to addition of numbers
up to 3 d.p. |
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| - Use standard column
methods for addition & subtraction of whole
numbers; extend to decimals |
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add
addition
difference
subtract
subtraction
sum
total |
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Recap standard addition
method
Recap standard subtraction method |
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1) 'Hexagons': identify
pairs that add
(mentally) and record
2) 'Hexagons': identify pairs that subtract
(mentally) and record
3) Word Problems: eg:
Builder
Ted Game level 3 |
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Use white boards
All pupils to show (on own whiteboards) 3 subtractions
& 3 additions |
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