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Grade 5 · Maths · Lessons
Lining up the point
•point➕add➖take away0️⃣zeros
Line up the point.
The big ideaPoints in a line. Zeros fill the gaps. Then add or take away, place by place.

How it works

Line the points up in a column. Zeros fill the gaps.

Then add or take away, place by place.

Write the point straight down in the answer.

Lined up• 1.08• 3.00Add• 4.08
1.08 + 3.

Example 1: Take away

  1. 7.4 − 0.3 = ?
  2. Line up 7.4 and 0.3.
  3. 4 tenths − 3 tenths = 1 tenth, so 7.1.
  4. So the answer is 7.1.

Example 2: Add a whole number

  1. 1.08 + 3 = ?
  2. Write 3 as 3.00.
  3. 1.08 + 3.00 = 4.08.
  4. So the answer is 4.08.

Example 3: From a whole number

  1. 40 − 2.46 = ?
  2. Write 40 as 40.00.
  3. 40.00 − 2.46 = 37.54.
  4. So the answer is 37.54.

Words to know

decimal point
The dot between ones and tenths.
place
Where a digit sits.

Watch out

Try it

  1. 9.46 + 8.11 = ?
  2. 7.6 − 1.84 = ?
  3. 9 − 7.3 = ?
Answers: 1. 17.57 · 2. 5.76 · 3. 1.7
For grown-upsAdd prices like $3.45 and $1.20 by lining up the points.
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