Download Maths Calculation leaflet Addition and Subtraction

In Pluto, our teaching is organised according to age related expectations of the National
Curriculum and the St. Peter’s Calculation Policy. Pupils are taught the method
appropriate to the curriculum that they are working towards and move on when they enter
the next year group or are secure enough to do so.
Supporting your child at home
Key things you can do to support your child’s learning at home are:
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Help your child learn their number bonds to 10 and 20. This includes any
calculation within 10 and 20 e.g. 4+3=7, 14+3=17. This will help your
children with their mental maths fluency.
Count in 2s, 5s and 10s (Year 2 need to count in 3s) This will support your
child when we start working on multiplication and division.
Reinforce concepts of place value. The children need to understand the value
of tens and ones within numbers e.g. the number 27 has 2 groups of ten and 7
ones.
Form their digits correctly. Children will often write them the wrong way e.g.
14 instead of 41.
Support your child while they complete their homework. The homework will be
linked to the work completed in class. The children will have learnt various
methods as stated below. Start by asking your child if they remember the
method from class. This leaflet should help you support your child if they are
‘stuck’.
Reasoning
Developing mathematical ‘reasoning’ skills (how we think and talk about mathematical
concepts) is an integral part of every lesson. We encourage children to be number
detectives: to look for patterns and to explain or ‘prove’ their ideas as this improves
their understanding and makes them more confident mathematicians.
Addition and subtraction
Addition and subtraction are taught together to enable children to see the links
between the two operations. We encourage the children to prove and check their
calculations using the inverse operation and/ or mathematical resources such as number
lines or Numicon (see photos of these below).
For children accessing the Year 1 curriculum, we will begin using concrete objects such
as Numicon and counters before moving on to pictorial methods using a number line.
For children accessing the Year 2 curriculum, we will use concrete objects alongside
the pictorial methods. The children are expected to draw their own number line and/or
use blank number lines. The children will learn to bridge ten to support calculations
involving two digit numbers.
They will move on to addition and subtraction by partitioning when ready.
Children in year 2 are excepted to show that addition of two numbers can be done in
any order (commutative) and subtraction of one number from another cannot.
During addition and subtraction, the children will all move from the concrete to
pictorial to the abstract. However, we always return to the concrete to ensure children
have a deep understanding of the concept.
Key equipment:
Numicon
Ten frame
Dienes
Bead string
Models:
Part, Part Whole Model
Bar Model
Number line
Addition
Key learning objectives
I can add two numbers together.
add, altogether, and, makes, more
Concrete:
Children use any objects including cubes, numicon and counters to combine two amounts.
4
+
2
=
6
Pictorial:
Children use pictures to add two groups of numbers together.
4
+
2
=
6
I can count on from the largest number
equal, =, sum, plus
Concrete:
Children add two numbers together by counting on from the largest number. They can use a
bead string or objects.
Pictorial:
Children add two numbers together using a number line. They start at the largest number and
count on.
I can add two numbers together by bridging ten
addition, increase, inverse, total
Concrete:
Children add together two numbers by regrouping to the nearest multiple of ten.
E.g. 7 +8 =15
Ten frame
Pictorial:
Children bridge ten by drawing their own number line or using a blank number line.
Subtraction
Key learning objectives
I can subtract a single digit number
how many have gone?, left over, less, take away
Concrete:
Children use any objects to subtract a one digit number.
6-2 = 4
Pictorial:
Children use pictures to subtract a single digit number.
6-2= 4
I can subtract numbers by counting back
equals, =, minus, subtract
Pictorial:
Children count back from the largest number on a number line.
I can subtract by finding the difference
decrease, difference, inverse, subtraction
Concrete:
Children can use objects to find the difference between two numbers.
The difference between 10 and 8=2
Pictorial:
Children use a number line to count up to find the difference.
Year 2:
Children find the difference on a blank number line by bridging ten.