Số đếm Arithmetic zero one two three four five six seven eight nine 10 11 12 13 14 15 16 17 18 19 -245 22 731 000 000 56 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 Ten Eleven Twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen 20 30 40 50 60 70 80 90 100 1000 minus two hundred and forty-five twenty-two thousand seven hundred and thirty-one one million fifty-six million one billion [US usage, now universal] seven billion [US usage, now universal] one trillion [US usage, now universal] three trillion [US usage, now universal] Fractions [= Rational Numbers] (Phân số) Số thực twenty thirty forty fifty sixty seventy eighty ninety one hundred one thousand Các phép toán bản Exponentiation, Roots (Lũy thừa) Inequalities (Phép so sánh) Hình học Hình Khối Consecutive: Liên tiếp