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Purpose

The purpose of this activity is to develop useful strategies for mental calculation when estimating possible addition solutions.

Achievement Objectives
NA2-1: Use simple additive strategies with whole numbers and fractions.
AO elaboration and other teaching resources
Specific Learning Outcomes

estimate the sum or difference between numbers.

Required Resource Materials
Chart
Activity
  1. Draw this chart on board

chart.

  1. Tell the class that the aim of the activity is to locate pairs of numbers which fit the given criteria.
  2. Which pairs have a total between 250 and 300? (avoid exact sum or difference)
    How do you know?  How did you work that out? 
  3. Variations
  • Total close to 250
  • Difference close to 50
  • Total close to 350
  • Difference close to 75
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Level Two