问题
填空题
看一看，算一算。
1. four － one = 2. seven － two = 3. eight － six =
4. seven + three = 5. six + three = 6. five + one =
7. five + four = 8. nine － one =
答案
1. three 2. five 3. two 4. ten 5. nine 6. six 7. nine 8. eight