1. Write the missing numbers. 1) one + ten = ______ 2) four + ______ = nineteen 3) seventeen − five = ______ 4) fourteen − one = ______ 5) ______ + two = twenty 6) nine + seven = ______

1. one + ten = eleven
2. four + fifteen = nineteen
3. seventeen − five = twelve
4. fourteen − one = thirteen
5. eighteen + two = twenty
6. nine + seven = sixteen

Ответ: 1) eleven; 2) fifteen; 3) twelve; 4) thirteen; 5) eighteen; 6) sixteen.