Transition Year Maths NOTE
On some calculators the number must be entered before the calculation is done.
5 · 2 =
d c
. . . . . . . . . . . . . . .
26 5
(h)*Factorial x! To find 5! (5! means 5 × 4 × 3 × 2 × 1) 5 X! = (i)** Combinations nCr
How many combinations of two things can be made from five things. 5 2 means
nCr
54 21
× × ==
20 2 10
5 nCr 2 (j)** Permutations nPr
How many permutations of two things can be made from five things. 5 2 means 5 × 4 = 20
nPr 5 nPr 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
* See Chapter 16 (Interesting Numbers). ** See Chapter 10 (Probability) and Chapter 11 (Combinations and Permutations).
(k) Brackets ( ) The computation in the bracket will always be done first. 3 + 4 × 5 (3 + 4) × 5 3 + (4 × 5) % 3 + 4 × 5 = ( 3 3 + (l) Percentage To find 5% of €80 8 0 × 5 % = 6 . . . . . . . . . . . . . . . . 4
+ 4 (
4 ) . . . . . . . . . . . . . . . 23 × 5 = × 5 ) = . . . . . . . . 35 . . . . . . . 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
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