Numbers to 100 and Place Value · Number and Operations

Mental Calculation Strategies

Developing fluency in adding and subtracting numbers mentally using number bonds and place value.

Key Questions

  1. 1What is the most efficient way to solve this problem in your head?
  2. 2How can making a ten help us add two numbers quickly?
  3. 3Why might different people use different mental paths to get to the same answer?

MOE Syllabus Outcomes

MOE: Addition and Subtraction - P1
Level: Primary 1
Subject: Mathematics
Unit: Numbers to 100 and Place Value
Period: Number and Operations

Suggested Methodologies

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Learning how to group ten ones into a single unit of ten to make counting large numbers easier.

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Addition and Subtraction Within 100

Performing operations with larger numbers using place value strategies without formal regrouping initially.

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