Primary National Strategy - Interactive Teaching Programs



Index

Area
Calculating angles
Coordinates
Counting on and back
Data handling
Decimal number line
Difference
Division Grid
Fixing points
Fractions
Grouping
Isometric grid
Line graph
Measuring cylinder
Measuring scales
Moving digits
Multiplication facts
Multiplication grid
Number dials
Number facts
Number grid
Number line
Number spinners
Ordering numbers
Place value
Polygon
Remainders after division
Ruler
Symmetry
Tell the time
Thermometer
Twenty cards

Number facts

This ITP displays up to 20 coloured counters and the corresponding addition sentence. The number of counters you select, appear on the screen in purple. Click on any counter to change its colour, the number sentence also changes. To hide and reveal the number sentence, click on the box with the question marks. You can replace a number in the number sentence with a question mark by clicking on the number, and drag counters around the screen to form groups. Addition can be changed to subtraction by clicking on the addition sign in the box. Counters can be dragged into the displayed box, which you can make opaque to hide the counters.

The ITP can be used to model addition by combining and counting, and subtraction by partitioning and taking away. The hide and reveal options allow you to pose questions with unknown numbers in different positions in the number sentence. Partitioning counters in different ways helps children to identify all sums and differences of numbers to 20.




Run this ITPRun Number facts 1.4
Addition

number facts controls

number of counters buttonUse the pointers to increase or decrease the initial number of counters.

Click on the number to place that many counters on the screen.

hide or show calculationClick to hide or show the calculation.

addition or subtraction buttonClick on the plus sign to toggle between addition and subtraction.

In subtract mode the top button makes the ‘bin’ opaque and the lower button makes it semi-transparent.

Subtraction

Model subtraction by dragging counters into the ‘bin’.

The bin can be opaque or transparent.

bin for counters

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Copyright © 2005 Primary National Strategy