As they are doing this, circulate around the room with the yam. The students test their estimation by putting one end of the yam in the center of their apple and placing the string around their apple, remembering to keep it on the center. If there was left over string their estimation was too much. If there was not enough string their estimation was too little. If the string fit perfectly their estimation was just right.
Students then graph their estimation on a class graph using their string.
Next have students estimate the weight of their apple and record their estimation on their recording sheet. Students weight their apple on the scale and record the actual weight on their recording sheet. A class bar graph can then be created showing the students results. Lastly, have students estimate the number of seeds in their apple and record on their recording sheet. The teacher then cores each apple and the students count the number of seeds actually in their apple.