4. Subtraction Talk About


As we know, subtraction is when a certain number (or amount) is taken away from another number.


For example: There are 467 pupils in St Joseph’s School. At 1:30pm, 112 infants go home.


How many children are left in the school after 1:30pm?


Memory Check! 1.


a) 27 – 15


b) 16 – 10


c) 32 – 22


d) 15 – 2


e) 52 – 18


f) 41 – 17


g) 80 – 44


h) 21 – 9


Remember: Although a question may be written sideways (horizontally), it is always best to rewrite it downwards (vertically) before subtracting, keeping the larger number on top.


2. a) 78 – 43 = – b) 92 – 11 = – c) 51 – 29 = – d) 47 – 38 = –


Subtracting Bigger Numbers Subtracting 3-digit numbers is very similar to subtracting 2-digit numbers. 3. Try these:


a) HTU 564


– 352


b) HTU 489


– 278


c) HTU 247 33


– d) 534 – 202 = – Strand: Number


Curriculum Objectives: Subtract within 999, with and without renaming; know and recall subtraction facts; solve word problems involving subtraction.


21 e) 361 – 300 = – School Work out the answer in this box.


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