Addition and Subtraction: Year Four

This series of fourteen interactive excel sheets aimed at students in Year Four look at a variety of integer addition and subtraction methods and questions.

The first sheet shows a combination of numbers to be added together, with a running total which can be revealed at each stage. The following sheet asks students to match up five questions and answers on addition or substitution. New questions can be generated at the click of a button.

In the third sheet students are given questions in which an addition crosses a multiple of 10. There are six possible options to choose from and hints are available. The next sheet contains three addition questions containing numbers ending in 0 or 5. The fifth sheet asks pupils to add a number between the values 10 to 490 to itself. Hints and the answers can be revealed at the click of a button.

The following two sheets demonstrate how to partition numbers when adding or subtracting two-and three-digit numbers.

The eighth sheet in the series demonstrates adding hundreds, tens then units for two- and three- digit addition. The following sheet shows the compensation method for addition, answers can be revealed at each stage. The next sheet demonstrates common written methods including the ‘carry’ method.

The final four sheets explore methods for subtraction. The first looks at subtraction by complimentary addition, the second at subtraction by compensation and the third sheet deals with subtraction by decomposition. The final sheet demonstrates the traditional written method of subtraction with borrowing.

Note:

This program was designed to be viewed on a screen with a resolution of 1024 x 768. Users may have to adjust the resolution of their screen for the pages to display as was originally intended. The program uses macros which need to be enabled on the users' machine.