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Level Two > Number and Algebra

Subtraction in parts

Keywords:
Achievement Objectives:

Achievement Objective: Use simple additive strategies with whole numbers and fractions.

Purpose: 

These exercises and activities are for students to use independently of the teacher to practice number properties.

Specific Learning Outcomes: 

solve subtraction problems by splitting numbers into parts

Description of mathematics: 

Addition and subtraction, EA (Stage 5)

Required Resource Materials: 
Practice exercises with answers (PDF or Word)
Activity: 

Prior Knowledge

Identify ones and tens in any two digit number

Background

This activity uses place value partitioning as a strategy for solving subtraction problems.  This strategy is useful in problems when the ones digit is the number being subtarcted is larger than the ones in the starting number, e.g. 41- 15.

Comments on the Exercises

Exercise 1
Asks students to identigy if the number has been correctly partitioned

Exercise 2
Asks students to complete the partition for the subtraction question.

 

Related Resources: 
Book 5: Subtraction in Parts
AttachmentSize
SubtractionInParts.pdf92.36 KB
SubtractionInParts.doc34.5 KB

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