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Foundations · Level 5 of 12

Decimals, angles and volume

Everything else in maths is built on number sense: what a number means, how place value works, and why a method like carrying or long division gives the right answer. Kanakku draws every sum as a picture first (coins, ten frames, place-value blocks), so the method makes sense before it becomes routine. It is the right place to start whether you are learning this for the first time or filling old gaps.

Lakhs & big numbers

Place value to ten lakhs, number names and rounding.

Key idea

In India we count ones, thousands, lakhs and crores. 1 lakh = 1,00,000.

How to do it

  1. Put commas from the right: after 3 digits, then after every 2.
  2. Read each group: lakhs, then thousands, then hundreds, tens and ones.
  3. A digit's value = the digit × its place.
Practise lakhs & big numbers

Decimals

Tenths, hundredths and money with a decimal point.

Key idea

A decimal is another way to write tenths and hundredths: 0.5 = 5 tenths = ½.

How to do it

  1. The first digit after the point is tenths.
  2. The second digit is hundredths.
  3. To compare, line up the points: 0.5 = 0.50, which is more than 0.45.
Practise decimals

Angles

Acute, right, obtuse and straight angles.

Key idea

An angle shows how much something turns. A right angle is the corner of a book.

How to do it

  1. Compare the angle with the corner of a book.
  2. Smaller than the corner: acute.
  3. Bigger than the corner: obtuse. A straight line: a straight angle.
Practise angles

Volume & capacity

Count cubes in a box, and use litres and millilitres.

Key idea

Volume is how many cubes fill a box: length × width × height.

How to do it

  1. Count the cubes in one layer: length × width.
  2. Count the layers: that is the height.
  3. Multiply: cubes in one layer × number of layers.
Practise volume & capacity

Bar graphs

Read bar graphs with bigger numbers.

Key idea

A bar graph shows numbers as bars. Check the scale: each line may stand for 10 or more.

How to do it

  1. Read the title, the labels and the scale.
  2. Go to the top of a bar, then across to the scale.
  3. Compare bars to find the most, the least, the difference and the total.
Practise bar graphs

Games and tools for level 5