Written Out Shortcuts

Question 1

Multiplying by 5 (i.e. 6200 X 5)

Answer 1

Multiply by 10 and divide by 2 (i.e. 6200 X 10 = 62,000/2 = 32,000)

Question 2

Handling Zeroes

Answer 2

1. Count zeroes, assign placeholder (i.e. 5 for 20 X 620,000 which equals 100,000)
2. Multiply the non-zeroes (i.e. 2X62 = 124)
3. Multiply result w/ zeroes placeholder (i.e. 124 X 100,000 = 12,400,000

Question 3

Handling Lots of Zeroes

Answer 3

1. Assign shortcuts (1,000 = K)
2. Multiply non-zeroes
3. Multiply result w/ Shortcuts

Question 4

Messy Multipliers

Answer 4

1. Break down problem (i.e. 925X400 to 900X400+25X400)
2. Solve Each Component (360,000 + 10000)
3. Add the results (370,000)

Question 5

Division of Large numbers

Answer 5

Count the zeroes and move the decimal that much (i.e. 100,000,000/1,000 = 100,000)

Question 6

Division by 5

Answer 6

Divide by 10 then multiply by 2