Cover of the textbook Outcomes Beginner - Student's Book

The key answer of exercise 7

The key to exercise solutions in chapter 1 - Where's the party? for the textbook Outcomes Beginner - Student's Book with authors Hugh Dellar and Andrew Walkley from National Geographic Learning

Question

Listen and check.

Answer

  1. 18 (even numbers / add two each time)
  2. 20 (add four each time)
  3. 19 (prime numbers: numbers that cannot be divided)
  4. 15 (the number you add increases by one each time, so: +2, +3, +4, +5)