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<h3>Scale</h3>
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<h4>Equivalent mass, mental calculation</h4>
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<p> Place weights on the left pan to find the equivalent mass on the right tray. </p>
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<p> To add a weight on the left pan, drag and drop it on the pan. </p>
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<p> Inventory the possibilities on the board or test directly on the scale. </p>
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<p> "Reload" button removes the weight shown on the left pan. </p>
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<p>Enter the "Edit" mode to : </p>
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<ul> <li> choose the theme of the App : pad, slate, or none (by default : pad), </li>
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<li>determine the mass on the right pan,</li>
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<li> determine weights you want to use for the left pane.</li> </ul>
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<p> To move a weight in the right tray, drag and drop it on the pane.</p>
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<p> To add weight, click the "+" button and enter a mass (don't use decimal numbers). </p>
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<p> weights have a field number. Click the box and enter the desired digits. </p>
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<p>"Display" button comes back to the activity.</p>
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