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St. Joseph’s Catholic Primary School Tuesday 15th October 2013
KS1 Mathematics Workshopled by KS1 Team
Miss Brown (Yr.1) Mrs Morrin (Yr.2) Mathematics Leader
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Aims of the Workshop
To explore the different mental strategies & written calculation methods for addition, subtraction, multiplication and division.
To see the progression and the development in the different calculation methods from
Year 1 on Year 2.
To share strategies with you today so you can support your child at home.
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Yr. 1 Addition –
Objectives: To relate addition to counting on. To recognise that addition can be done in
any order. To use concrete and pictorial methods to
support the addition of a one-digit number or a multiple of ten to a one or two digit number.
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Yr.1 – How to teach Addition at home
Methods/strategies: Combining two sets and counting all Put the larger number first and find the total
by counting on Use our fingers to count Use a number line to count on Record as an equation or a number sentence e.g.12 + 2 = 14
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Year 2 – Addition Objectives
Add or subtract mentally a one-digit number or a multiple of 10 to or from any two-digit number; use concrete and pictorial methods to add and subtract two-digit numbers.
Understand that subtraction is the inverse of addition and vice versa; use this to derive and record related addition and subtraction equations.
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Year 2 – How to teach Addition at home
Count on in tens and onesRecord as: 23 + 12 = 23 + 10 + 2 = 33 + 2 = 35
23
+10 +2
35 33
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Year 2 – Addition methods
Partition into tens and ones and recombine Record as: 12 + 23 = 10 + 20 + 2 + 3 = 30 + 5 = 35
+10 +20+2 +3
0 30 35
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Yr. 1 - Subtraction
Objectives: Understanding subtraction as “taking away” Find a “difference” by counting up Use concrete and pictorial methods to
support the subtraction of a one-digit number from a one digit number or two-digit number
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Yr.1 - Subtraction
Understand subtraction as 'taking away'.
Can record 6 -1 as:
(1) Count how many strawberries are left after 1 has been taken away or eaten
(2) Count back on a number line
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Year 2 – Subtraction Objectives
Add or subtract mentally a one-digit number or a multiple of 10 to or from any two-digit number; use concrete and pictorial methods to add and subtract two-digit numbers.
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Year 2 – Subtraction Methods
Find a small difference by counting up42 – 39 = 3
42 39 40
+ 1 + 2
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Year 2 – Subtraction Methods
Use known number facts and place value to subtract (partition second number only)
37 – 12 = 37 – 10 – 2 = 27 – 2
= 25
372725
- 10- 2
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Year 1 Multiplication & Division
Multiplication Recognising multiplication as repeated addition Counting on in multiples of 2’s, 5’s & 10’s Recalling doubles of all numbers to at least 10
Division Grouping & sharing equally
Strategies: Using fingers, number line & cubes
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Year 2 – Multiplication
5 x 3= 15
3 x 5
5 + 5 + 53 + 3 + 3 + 3 + 3
Arrays
+ 3 + 3 + 3 + 3 + 3
0 15
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Year 2 – Division
15 ÷ 3 = 5 -3 -3 -3 -3 -3
150
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Thank you for coming!