Lesson 7

Multiplication Strategies for Larger Numbers

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

TIMS Task

While practicing primes and factors, students can review the division facts for the 2s and 3s.

  1. 53, 67, 103
  2. 53 is not divisible by 2, 3, 5, or 6 using the divisibility rules. Using a calculator
    53 ÷ 4 = 13.25
    53 ÷ 7 = 7.57 …
    53 ÷ 8 = 6.625

X. Prime Factors

  1. Which of the following are prime numbers?

    53     54     57     67     96     103
  1. Tell how you decided 53 is or is not prime.
  2. For the numbers that are not prime, use factor trees to factor them into a product of prime numbers. Write a number sentence showing the factors. You may use a calculator to help.