Explain that count 31-99 is a mix by one, two, three, four, five, six, seven, eight, nine, ten, thirty, including the number of digits after forty, fifty, sixty, seventy, eighty, ninety, so have the students have only numbers ending with zero is that 30, 40, 50, 60, 70, 80, 90.
การแปล กรุณารอสักครู่..
