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年化十年期 = tahun ke dekad 问有几个 dekad，就是看年数里有几个十年，用年数除以十。能除尽就只有 dekad，没有余下的年。注意百位上的年也要一起换成 dekad。 例子：300 年 → 300 ÷ 10 = 30 dekad。 注意：余下的年一定少于十；二十年、三十年这样的年数还可以再换成 dekad。

years to decades = tahun ke dekad To find how many dekad, see how many tens are in the years: divide by 10. If it divides exactly there are no years left. The hundreds must be changed into dekad too. Example: 300 years → 300 ÷ 10 = 30 dekad. Watch out: the years left are always fewer than 10; twenty or thirty years can still become dekad.

世纪和十年期化年 = abad dan dekad ke tahun 分开换算再相加：abad 的数目乘一百，dekad 的数目乘十，两个结果加起来就是总年数。用数位想：abad 放在百位，dekad 放在十位。 例子：2 abad 3 dekad → 200 + 30 = 230 年。 注意：dekad 要乘十，不能直接当作几年加上去。

centuries and decades to years = abad dan dekad ke tahun Convert each part and add: abad × 100 and dekad × 10, then add the results. With place value, abad go in the hundreds and dekad in the tens. Example: 2 abad 3 dekad → 200 + 30 = 230 years. Watch out: multiply the dekad by 10; do not add them as single years.

古炮的年龄 = usia meriam 题目要用 abad 和年来表示。把年数拆成整百年和剩下的年：整百年换成 abad，剩下不到一百的年照写。检查：剩下的年数要少于一百，而且一年都不能漏。 例子：315 年 → 300 + 15 → 3 abad 15 年。 注意：剩下的年数要少于一百，而且一年都不能漏掉。

the age of a cannon = usia meriam The answer must be in abad and years. Split the years into whole hundreds and the years left: the hundreds become abad and the rest stay as years. Check that the years left are under 100 and that none are missing. Example: 315 years → 300 + 15 → 3 abad 15 years. Watch out: the years left must be fewer than 100, and none may be left out.

十年期化年 = darab 10 从 dekad 换成年是大单位换小单位，要乘十：dekad 的数目乘十，就是年数，也就是在后面加一个零。 例子：7 dekad → 7 × 10 = 70 年。 注意：乘十只加一个零；加两个零是 abad 的换算，把十加上去也不对。

multiply by 10 = darab 10 Dekad to years goes to a smaller unit, so multiply by 10: the number of dekad times 10 is the years, which means adding one zero. Example: 7 dekad → 7 × 10 = 70 years. Watch out: multiplying by 10 adds one zero; two zeros is the rule for abad, and adding 10 is wrong too.