① 乐乐能判断下列算式是否正确，你能吗？来试试吧，正确的在括号里写“T”，错误的写“F”。
() (1) ten + one = eleven
() (2) thirteen - two = seven
() (3) twelve + three = fifteen
() (4) fourteen - six = nine
() (5) fifteen - eleven = four

1. (1)T (2)F (3)T (4)F (5)T

2 请你和乐乐一起读一读，找出规律，并将正确的英文数字写在四线三格内。
(1) twelve, eleven, ten, , eight, seven
(2) one, three, five, , nine, eleven
(3) five, six, seven, eight, nine, ten,
(4) two, four, six, eight, ten,

2. (1)nine (2)seven (3)eleven (4)twelve