Lesson 10

Strategies for Multiplying Decimals

Est. Class Sessions: 3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

  1. 700,000 + 3,000 + 500 + 90 + 9 = 703,599
  2. 300,000 + 40,000 + 9,000 + 600 + 50 + 2 = 649,652
  3. 400 + 20 + 5 + .8 + .03 = 425.83
  4. 60 + 9 + .5+ .08 + .002 = 69.582
  5. 2000 + 90 + 4 + .7 + .001 = 2094.701
  6. In each number for A–D the digit 5 is worth .1 less than in the previous number. In A the 5 is worth 500, in B the 5 is only worth 50, in C it is worth 5, and in D it is worth .5.

GG. Expanded Form

Write each number below using expanded form.

  1. 703,599
  2. 349,652
  3. 425.83
  4. 69.582
  5. 2094.701
  6. How does the value of the digit 5 change in the numbers in Questions A–D?