Кауфман, 5. Рабочая тетрадь 1. Unit 3. Lesson 4

Запишите цифрами и решите примеры.
1) seven plus one is eight (7+1=8)
2) twelve minus two is ten (12-2=10)
3) eighteen minus three is fifteen (18-3=15)
4) twenty plus fifty is seventy (20+50=70)