So-called Clean Numbers Flashcards
1
Q
Decomposition of
$32 x 25,000
A
32 x 25
25 = 1/4 x 100
Using the decomposition of 25
32 x 1/4 = 32 / 4 = 8
8 x 100 = 800
2
Q
To multiply any number by 25?
A
Divide by 4 and multiply by 100
3
Q
50
A
1/2 x 100
4
Q
5
A
1/2 x 10
5
Q
250
A
1/4 * 1,000
1/4 k
6
Q
75
A
3/4 x 100
7
Q
150
A
3/2 x 100
8
Q
7.5
A
3/4 x 10
9
Q
0.05
A
1/2 x 0.1
10
Q
2.5%
A
1/4 x 10%
11
Q
33%
A
1/3
12
Q
67%
A
2/3
13
Q
Something x 4
A
Double it. Then double it again.
