Lesson 5

Find Prime Factors

Est. Class Sessions: 1

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

C is the best estimate. 60 is closest to 61, and 75 is closest to 74. The other choices are either too high or too low.

O. Best Estimate

There are 61 rows of pear trees in the orchard. In each row there are 74 trees. Fill in the circle next to the best estimate for how many pear trees there are altogether. Explain how you know.

  1. 80 × 50 = 4000
  2. 65 × 75 = 4875
  3. 60 × 75 = 4500
  4. 60 × 80 = 4800