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三位数的年龄差 = beza usia tiga digit 先用竖式求出两个年龄相差多少年：个位、十位、百位依次相减，不够减就借位。再把得到的年数写成 dekad 和年：十位以上的部分是 dekad 的数目，个位是年。 例子：120 − 95 = 25 年 = 2 dekad 5 年。 注意：求“相差”要用减法；把两个年龄加起来会得到很大的数。

a three-digit age difference = beza usia tiga digit First subtract the two ages in columns, ones, tens and hundreds, borrowing when needed. Then write the result in dekad and years: the part from the tens upward is the number of dekad and the ones digit is years. Example: 120 − 95 = 25 years = 2 dekad 5 years. Watch out: a difference needs subtraction; adding the two ages gives a very big number.

老多少年 = berapa lebih tua 题目问甲树比乙树老多少，就是求两个年龄的差。两位数相减时，个位不够减要向十位借一，十位就少一。算出差以后，把十位看成 dekad 的数目，个位看成年。 例子：70 − 26 = 44 年 = 4 dekad 4 年。 注意：借位以后十位要少一，否则会多出一个 dekad。

how much older = berapa lebih tua The question asks how much older tree A is, which is the difference between the ages. In two-digit subtraction, if the ones are too small, borrow 1 from the tens, so the tens go down by 1. Then read the tens as dekad and the ones as years. Example: 70 − 26 = 44 years = 4 dekad 4 years. Watch out: after borrowing, the tens are 1 less, or you get an extra dekad.