Fifth Grade · Math · week 3

Compare and round decimals

Compare decimals using less than, greater than, or equal to, and round decimals to a given place.

To compare decimals, line up the decimal points and compare digit by digit from the left, exactly like whole numbers. Extra zeros on the right never change the value: 0.5 and 0.50 are the same amount.

Rounding decimals uses the same rule as rounding whole numbers: look at the digit just past the place you are rounding to. Five or more rounds up; four or less stays the same.

📋 For the teacher
Teach it (10–15 min):
  • Line up decimal points vertically like a ledger, then add trailing zeros so every number being compared has the same number of places.
  • For rounding, box the target place and underline the digit right after it -- that neighbor decides whether it rounds up or stays.
  • Use real numbers to practice: race times, measurements from a ruler, or sports statistics with decimals.
  • Remind them that zeros at the very end never change value, but a zero in the middle of a number absolutely does.
Talk about it:
  • Why does lining up decimal points matter when comparing?
  • What is the rule for rounding when the next digit is 5 or more?
  • Does writing an extra zero at the end of 0.5 change its value? Why not?

Mastery looks like: They can compare decimals to the thousandths and round any decimal to a stated place correctly and consistently.

Common stumbles: Judging decimal size by how many digits are printed, thinking 0.9 is less than 0.62; rounding based on the wrong neighboring digit.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Math for this learner.
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