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Dividing Decimals

The Hook

Moving the wall.

What is it?

How to handle a decimal point in the divisor.

Time Travel (History)

Crucial for scientific measurements.

Cheat Code

Move the decimal in the OUTSIDE number to the right until it's whole. Do the same to the inside.

Practice This Now!

The Field Guide

In Plain English: We hate dividing by decimals (like 1.5). We prefer whole numbers. So we multiply both numbers by 10 (move the dot) until the outside number is clean.

In The Real World: Figuring out how many $0.25 gumballs you can buy with $5.00.

How To Do It

  1. Look at the Divisor (Outside).
  2. Move dot right until it's a whole number.
  3. Move the Dividend (Inside) dot the SAME number of jumps.
  4. Raise the roof (put dot straight up in answer).
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Booby Trap!

Moving the dot on the outside but forgetting to move it on the inside.

Real World Challenge
"A plank is 1.5 meters. You have 4.5 meters of wood. How many planks?"
The Logic: 4.5 ÷ 1.5 -> Move dots -> 45 ÷ 15 = 3 planks.

Training Drills

The Slide
1.2 | 3.6 becomes 12 | 36
Moved dot 1 time.