Discuss with students a mathematical way to determine area when you know the length and width. Stress that a number sentence can be used to find area. Stude nts will need to estimate the length and width of each object and write down their estimation. Students will use customary measuring tools to measure and find the area of each object. Record their answers.
Students compare their estimation with the actual measurement.
Give the students the same 10 items. Students will be asked to use metric measuring tools to measure and find the area of each object. Student should again estimate the length and width of each object before actually measuring it. Students should compare their estimation with actual measurement. Remind students that rounding might be necessary.