Lesson 3

Number Sentences

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

  1. Yes; students can use convenient numbers to quickly determine this answer in their head.
  2. The purchases cost about $2.50 + $1.50 + $3.00 = $7.00. You will get back about $3.00.
  3. Answers will vary. A possible response is using the convenient numbers given in the answer for Question 2.

K. Estimating Your Purchase

  1. You are at a store and do not have paper and pencil. You buy a gallon of milk for $2.49, a box of crackers for $1.56, and a magazine for $2.95. Will $10.00 be enough to pay the bill?
  2. About how much change will you get back?
  3. Explain how you estimated to answer Questions 1 and 2.