Answer — Exercise 5

a)

1. What’s three plus one? four
2. What’s nine plus two? eleven
3. What’s thirteen plus three? sixteen
4. What’s eight plus five? thirteen
5. What’s seven plus five? twelve
6. What’s six plus four? ten
7. What’s ten plus four? fourteen
8. What’s five plus three? eight
9. What’s eight plus three plus seven? eighteen
10. What’s eleven plus seven plus two? twenty

c)

• 25
• 33
• 47
• 50
• 66
• 78
• 81
• 99