Plasticine Snakes
Estimate and select the snake that you think is the longest, either the red or green. Follow the instructions and drag the top snake to the starting line. Click and drag a measuring unit below the snake. Continue to click and drag measuring units to measure the length of the snake. Type the number of units used in the white box. Drag the other snake to the starting line and use the units to measure the length of the snake. Write the number of units used in the white box and press "check".
(Teacher discuss) why the measurement may be incorrect.
