1. Write the following in words:a. 138 000 ...

Cách 1:
1. Đọc lần lượt các số và viết ra bằng chữ, từng phần hàng của số:
a. 138 000 → One hundred thirty-eight thousand.
b. 265 400 → Two hundred sixty-five thousand four hundred.
c. 478 652 → Four hundred seventy-eight thousand, six hundred fifty-two.
d. 2 843 670 → Two million, eight hundred forty-three thousand, six hundred seventy.
e. 8 955 461 → Eight million, nine hundred fifty-five thousand, four hundred sixty-one.
g. 7 956 323 → Seven million, nine hundred fifty-six thousand, three hundred twenty-three.
h. 68 972 436 → Sixty-eight million, nine hundred seventy-two thousand, four hundred thirty-six.
i. 77 888 999 → Seventy-seven million, eight hundred eighty-eight thousand, nine hundred ninety-nine.
k. 123 456 789 → One hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine.
l. 1 000 000 000 → One billion.
m. 3 400 300 500 → Three billion, four hundred million, three hundred thousand, five hundred.
n. 19 000 000 000 → Nineteen billion.

Cách 2:
1. Phân tách số ra thành từng phần hàng: hàng trăm, hàng nghìn, hàng triệu, hàng tỷ.
2. Đọc từng phần hàng ra bằng chữ và kết hợp lại với nhau.
Ví dụ:
a. 138 000 → Đọc ra là One hundred thirty-eight thousand.
b. 265 400 → Đọc ra là Two hundred sixty-five thousand four hundred.
c. 478 652 → Đọc ra là Four hundred seventy-eight thousand, six hundred fifty-two.
... (tiếp tục với các số còn lại)

Câu trả lời cho câu hỏi "1. Write the following in words":
a. One hundred thirty-eight thousand.
b. Two hundred sixty-five thousand and four hundred.
c. Four hundred seventy-eight thousand, six hundred and fifty-two.
d. Two million, eight hundred forty-three thousand, six hundred seventy.
e. Eight million, nine hundred fifty-five thousand, four hundred sixty-one.
g. Seven million, nine hundred fifty-six thousand, three hundred twenty-three.
h. Sixty-eight million, nine hundred seventy-two thousand, four hundred thirty-six.
i. Seventy-seven million, eight hundred eighty-eight thousand, nine hundred and ninety-nine.
k. One hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine.
l. One billion.
m. Three billion, four hundred million, three hundred thousand and five hundred.
n. Nineteen billion.