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Sunday, May 3, 2020

Maths

Everyone should be able to find 10% of an amount easily, because there is a place value trick to it.
If you are finding harder percentages, there is a formula to use (calculator allowed!)

Finding 10% in your head. Pick up the decimal place and move it one spot to the left -
E.g. $45.00 - move the decimal - $4.50 -- so 10% of $45 is $4.50


Finding 10% in your head

10% of that number
$150.00
15
$65.00
6.5
$75.00
7.5
$90.00
9
$140
14
$120
12
$125
12.5
$199.99
19.999
$250
25
$49.99
4.999
$1,500
150
$4,950
495

Finding percentages. 

Amount / total x 100 = 
E.g. 20/35 x 100 = 57%


= Percentage 
14/20
70
3/15
20
60/80
75
45/50
90
87/90
97
14/30
47
65/80
81.25
17/35
47
19/25
76
17/20
85
16/27
60
26/29
90
15/28
53
13/29
44
19/32
59
27/46
58
19/70
27
3/45
6
18/95
18
14/65
21

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