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Consulting 101 > Fast Math Practice > Flashcards

Fast Math Practice Flashcards

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1
Q

How to multiply by 25

A

Divide by 4 then multiply by 100

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2
Q

How to divide numbers with multiples of 4 by 4?

A

Left to right, digit by digit

Ex. 84/4 –> 8/4 =2 and 4/4 =1

concatenate to 21

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3
Q

How to divide numbers with non-multiples of 4 by 4?

I.e. 52/4

A

I.e. 52/4 –> decompose

  • -> 40/4 = 10
  • -> 12/4 = 3
  • -> concatenate to 13

OR divide by 2 twice

52/2 = 26 –> 26/2 = 13

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4
Q

8*25

A

8÷ 4 = 2

2 *100 = 200

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5
Q

16*25

A 
16/4 = 4
4*100 = 400
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6
Q

25*40

A 
40/4 = 10
10*100 = 1000
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7
Q

24*25

A 
24/4 = 6
6*100 = 600
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8
Q

25*60

A 
60/4 = 15
15*100 = 1500
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9
Q

25*18

A

450

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10
Q

26*25

A

26/4 = 6.5 –> 6.5*100=

650

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11
Q

25*9

A

9/4 = 2.25 –> * 100 = 225

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12
Q

17*25

A

425

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13
Q

25*900

A

22,500

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14
Q

25*800

A

20,000

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15
Q

160*25

A

4,000

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16
Q

1,200*25

A

30,000

17
Q

25 * 140

A

3500

18
Q

Decomposition of

$32 x 25,000

A

$800,000

19
Q

1/2 x 0.1

A

0.05

20
Q

1/4 x 10%

A

.025%

21
Q

Multiply single digit hundreds

E.g. 200 x 400

A

ten thousands

80,000

22
Q

Multiple single digit thousands (5k x 3k)

A

millions

15M

23
Q

Multiply single digit thousands by millions (e.g. 3M x 8k)

A

billions

24B

24
Q

Percentage multiplication

Multiply two percentages which are each multiples of 10 (e.g. 10% x 20%) and express answer as percentage

A

(10% x 20% = 2%)

25
Q

Single digit percentage multiplication and express answer as a percentage (e.g. 3% * 6%)

A

0.18%

26
Q

1k x 1k =

A

1M

27
Q

100 x 100

A

10,000

28
Q

M x K

A

B

29
Q

B / K

A

M

30
Q

K x K

A

M

31
Q

B x K

A

T

32
Q

T / K

A

B

33
Q

42B / 500

A

500 becomes 1/2k

Dividing by 1/2 is the same as multiplying by 2

42B divided by 1/2k is 84M

34
Q

120M x 250

A

250 is 1/4 x 1,000
250 is 1/4 K

1/4K x 120M
Is 30B

Consulting 101 (20 decks)

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