Lesson 5: Rounding Numbers to 10, 100 and 1000

 Lesson Plan

Tuning In

• Use the 5-Digit Place Value Warm Up – Interactive PowerPoint to revise the content of the unit so far. At this point in the unit, the students should be able to confidently answer questions 1-10 (slides 5-24). As the class works through the questions together, encourage the students to share their strategies and thought-processes.

Teacher Instruction

• Explore the definition of rounding, as outlined on slide 24 of the Exploring 5-Digit Place Value PowerPoint. Discuss the suggested processes for rounding numbers to the nearest 10 and 100, as outlined on slides 25-28. Encourage the students to suggest the process which might be followed when rounding numbers to the nearest 1000.
• Complete the whole class activity on slide 29, rounding the numbers on the bluebirds up or down to the nearest 100. Discuss the answers on slide 30. Ask the students to identify how the numbers on the bluebirds could be rounded to the nearest 1000.

Guided/Independent Learning

• Explain to the students that they are going to play a rounding card game in pairs. Project the instruction page from the Place Value Card Game – Race Up the Rounding Ladder on the board and read the instructions to the students. Answer any questions they may have about the game.
• Play a demonstration game with the students (the teacher could be Player 1 and the class could be Player 2). Project the pair of ladders on the board and place magnetic counters on each of the ‘Start’ rungs. Alternatively, use a whiteboard marker to write an ‘X’ which can be moved up or down the ladders. Decide whether to round to 10, 100 or 1000. Demonstrate how to select a number card from the pile, round the number and move up or down the ladder accordingly.
• Place the students into pairs and provide each pair with the necessary resources to play the game (a game board and a pack of number cards). Monitor and support the students as they play the game.

Wrapping Up

• Play a game of ‘Stand Up, Bob Down’ as a class. Call out a variety of 5-digit numbers which need to be rounded to the nearest 10, 100 or 1000. If the number needs to be rounded up, the students must stand up. If the number needs to be rounded down, the students must bob down. To make the game more competitive, eliminate the slowest student each time so that there is one student remaining at the end who can be declared the winner.

 Differentiation

Extending Students

• Place more capable students together for the rounding game so that they may extend and challenge each other.

Supporting Students

• Place less confident students together for the rounding game so that they can work through the activity at their own pace.

 Assessment Strategies

Suggested Assessment Strategies

• used strategic whole class or individual questioning
• observed student participation during learning activities
• recorded student progress on a checklist
• annotated student work samples
• collected and reviewed student work samples
• facilitated whole class or peer feedback sessions
• encouraged student self-reflection
• administered formal assessment tasks.

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