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Whinless Down Academy

Whinless Down Academy

Term 5

Year  1 Term 5

Key Concepts – Number –  Place Value, Addition and Subtraction

  • The language of number does not always expose the place value, the number eleven for example does not give an indication that it is 1 ten and 1 one – It is important that children understand the value of each digit in relation to the number
  • Place value is based on unitizing; Treating a group of things as one ‘unit’ – Units can be any size ie in place value units ot 1, 10 and 100 are used. In packaging there can be a range of different units ie 1 box of egg = 6 eggs.
  • That there are different words for add and subtract, but they mean the same thing.
  • That = can be at the start of a number sentence as well as the end.
  • That addition and subtraction are the inverse of each other
  • That you are unable to subtract a bigger number from a smaller number and the answer is positive.
  • Relate numbers to 5 and 10 to support addition/subtraction ie 8 + 7 (thinking of 7 as 5 + 2) which makes adding 8 + 7 easier as 8 + 2 = 10 etc.
  • Children need to understand part whole relationships ie where 8 is the whole and 3 and 5 are parts – this means that 3 + 5 together form the whole.

Key Vocabulary


Add, and,


Take Away



Ones, Tens, Digit,

More than, Less than,

Fewer, Greater,

 one to twenty,




Key Concepts – Topic – Mass/Weight

  • That measuring using Mass is about comparison to find out which is the heaviest
  • That you are able to make ‘Mass equivalence’ ie how many cubes are equal to the teddy?
  • All measures need practical activities to support understanding ie which is heaviest, which is lightest, how many are the same as .. etc.
  • Children make observations by looking and feeling and measuring.
  • Compare items that are of similar weight – order them

Key Vocabulary




Heavy, heavier, heaviest

Light, lighter, lightest.

Gram, kilograms





Common Misconceptions – Number

Children often get ‘teen’ numbers mixed up with ‘ty’ numbers ie 13 and 30 – It is important to demonstrate the value of each of the digits to understand the value of the whole number

That the equals sign can sit anywhere in a number sentence providing the two sides balance

That a unit does not always mean ‘1’

Common Misconception – Mass

The largest parcel isn’t always the heaviest, or the smallest the lightest

That Mass is continuous and most measurements are estimates – (the more scientific the measuring apparatus the better the estimate)

Scales can have different gradations