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 |
## Counting on and backThis ITP simulates a 100-bead string. You can move all the beads to the right of the string and move individual or groups of beads to the left side of the string by clicking on selected beads. |
Run Counting on and back 1.1 |

The controls also allow you to move 1 or 10 beads to the left or right of the string to show addition and subtraction. This ITP can be used to model different counting and calculation strategies. |

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