Phép cộng, Addition, Phép trừ, Subtraction, Giá trị, Value, con non, Juveniles, Trừ các phân số, Subtract fractions, Số thập phân, Decimals, Người trưởng thành, Adults, Số nguyên dương, Positive integers, Số nguyên âm, Negative integers, Ước lượng, Estimate, Cộng, Add, Trừ các số nguyên lớn, Subtract large integers, Hiệu / sự chênh lệch, The difference, Sơ đồ / hình minh họa, Diagram, Độ sâu lặn, Diving depth

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