## Mathematics tool

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### Purpose

• Understanding and recognising the concept of quantities
• Adding or subtracting numbers up to 100

The bead necklace is a visualisation of the mental number sequence. It has 10 red and 10 white beads or 5 white and 5 red beads. It has 10 red and 10 white beads or 5 white and 5 red beads with which you can practise the structures of ten, five and double numbers. With these structures, number pictures can be created that enable you can make the adding and subtracting of numbers up to 100 second nature. Select a bead and the number appears on the screen. You can choose between 20, 40, 60, 80 and 100 beads.

Press the cursor button in the toolbar to control the tool. Slide 1 or more beads from right to left. Or slide the beads from left to right. Click on 'Reset' to set all the beads to the middle.

### Purpose

• Understanding and recognising the concept of quantities
• Adding or subtracting numbers up to 100