Inequalities with decimals

Inequalities are mathematical statements that compare two expressions using symbols such as:

  • > (greater than)
  • < (less than)
  • (greater than or equal to)
  • (less than or equal to)
  • (not equal to)

Decimals are numbers that contain a decimal point (e.g., 3.5, 0.75, 2.13).

Decimals can be compared using inequality symbols just like whole numbers.

Step 1: Align the decimal points.

Step 2: Compare the digits from left to right.

Step 3: If the digits are the same, move to the next place value (tenths, hundredths, thousandths, etc.) until you find a difference.

Example: 3.45 > 3.4 (because 3.45 has a 5 in the hundredths place, while 3.4 has 0).

Example 1: 5.3 > 4.8

Example 2: 2.5 ≤ 2.5

Example 3: 0.75 ≠ 1.25

Just like whole number inequalities, you can solve inequalities with decimals by applying the same rules:

  • Add, subtract, multiply, or divide both sides of the inequality by the same number.
  • When multiplying or dividing by a negative number, flip the inequality sign.

Example: 1.2 + 0.3 < 2.0 (simplify to 1.5 < 2.0).

Which number is bigger, 8.019 or 8.03?

Follow the steps:

  • Write the numbers with the decimal points lined up.
8.019
8.03
  • Starting at the far left, which is the largest place value, compare the numbers.

The digit in the ones place in both numbers is an 8.

  • If the first place value is the same in both numbers, move one spot to the right and compare again.

The digit in the tenths place in both numbers is a 0.

  • If the second place value is the same in both numbers, move one spot to the right and compare again.

The digit in the hundredths place in the top number is a 1, and it is a 3 in the bottom number.

  • The number with the larger digit is the larger number.

Since 3 is bigger than 1, then 8.03 > 8.019

8.03 > 8.019

Learn with an example

let’s practice: