Prior knowledge.

• Add and subtract whole numbers, using a range of strategies
• Multiply and divide whole numbers by ten

Background

Students who are at stage 6 in the addition subtraction domain should have sufficient understanding of whole number addition and subtraction to transfer their strategies to decimals - once they have developed an understanding of the decimal point as a separator between the whole numbers and those numbers that are parts of a whole. (And learned to read decimals, developed an understanding of decimal place value and can order decimals).

Comments on the Exercises

Exercise 1
Asks students to use place value startegies to add decimals

Exercise 2
Asks students to put the missing decimal number in the box to complete the equation.

Exercises 3 and 4
Asks students to solve word problems involving addition and subtraction of decimals.