Lesson plan

Decimal, Fractions: Number Line Riddles!

Who doesn’t love a good riddle?! Using this lesson plan, your students will solve a puzzle while learning to read, write, and compare decimals to thousandths.
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Students will be able to read, write, and compare decimals to thousandths using a number line.

(5 minutes)
  • Show your students the number line from the first page of the Number Line Riddle worksheet.
  • Have your class think, pair, and share a three-letter word and its corresponding fraction or decimal on the number line (an example might be "car," where c is 3/4 , a is 1/4 and r is 4 2/4 or 4.5). Note how the number line is missing certain whole numbers; it’s tricky!
  • Let your students share out their answers with the whole class and challenge them to list both fraction and decimal form of their corresponding letters.
(10 minutes)
  • Explain that today’s lesson will be to perform the same task: find and state corresponding letters to fractions on the number line.
  • Refer to the opening activity number line and have students identify the corresponding numbers for letters that spell out someone’s first name. (See introduction procedure for format.)
  • Solve and answer any clarifying questions.
(10 minutes)
  • Hand out the Number Line Riddle worksheet, read the instructions, and lead your students to decode the first two words of the fun fact.
(15 minutes)
  • Answer any clarifying questions.
  • Release your students to finish the remaining words and solution for the second riddle individually.


  • Fill in the whole numbers on the number line as a whole class at the lesson opener.
  • In small groups, begin the independent work time by adding fraction and decimal forms to the riddle number lines.


  • Have students convert all numbers to decimals, and fractions in thousandths.
  • Clips is a free user-friendly iOS app that lets you make easily shareable videos. This is a great resource for creating custom lesson opening demonstrations.
(5 minutes)
  • Draft a word using one of the riddle number lines and ask students to tell corresponding fractions and decimal forms of each letter in the word.
  • Uplevel the assessment by having your students give letter-number correspondences to the thousandths.
(10 minutes)
  • Allow your students to share out answers with the whole class.
  • Complete the worksheet by writing both decimal and fraction forms for each letter of both riddles.

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