Akal Pintar

先加两张短的 = tambah dua kad pendek 两天十九小时加三天九小时：小时十九加九等于二十八，满二十四进一天，剩四小时；天数二加三加一等于六天。刚好等于六天四小时这张卡，所以可以写出两个减法算式。 例子：1 天 20 小时 + 2 天 6 小时 = 4 天 2 小时。 注意：长的那张一定放在减号前面。

add the two shorter cards = tambah dua kad pendek 2 days 19 hours + 3 days 9 hours: hours 19 + 9 = 28, regroup 24 as a day, 4 hours left; days 2 + 3 + 1 = 6. That equals the 6 days 4 hours card, so two subtraction sentences work. Example: 1 day 20 hours + 2 days 6 hours = 4 days 2 hours. Watch out: the longest card always goes before the minus sign.

选出正确的算式 = pilih ayat yang betul 判断方法：减法里，减号前面的时间必须是最长的，因为短的时间减去长的时间，不可能得到答案。再用加法检查：等号后面的时间加上被减去的时间，应该等于减号前面的时间。能通过检查的算式全部勾出来，可能不止一个。 例子：4 天 = 1 天 + 3 天，所以“4 天 − 1 天 = 3 天”和“4 天 − 3 天 = 1 天”都对。 注意：选好一个以后，还要逐一检查其他的算式。

choose the correct sentences = pilih ayat yang betul In a subtraction the time before the minus sign must be the longest, because taking a longer time from a shorter one is impossible. Then check by adding: the time after the equals sign plus the time taken away should equal the time before the minus sign. Choose every sentence that passes; there may be more than one. Example: 4 days = 1 day + 3 days, so 4 days − 1 day = 3 days and 4 days − 3 days = 1 day are both correct. Watch out: after finding one, check each of the others too.

四张卡连减 = tolak berturut-turut dengan empat kad 用四张时间卡组成“□ − □ − □ = □”。最长的那张一定放在最前面；另外三张加起来，要刚好等于最长的那张，算式才会成立。所以先把三张短的相加，看看是不是等于最长的，再排成算式，最后可以一步一步减来检查。 例子：10 天 − 2 天 − 3 天 = 5 天，因为 2 + 3 + 5 = 10。 注意：连减要从左到右一步一步做。

four cards in a row = tolak berturut-turut dengan empat kad Use four time cards to make □ − □ − □ = □. The longest card must go first, and the other three must add up to exactly the longest card for the sentence to be true. So add the three shorter cards, compare with the longest, arrange the sentence, then check by subtracting step by step. Example: 10 days − 2 days − 3 days = 5 days, because 2 + 3 + 5 = 10. Watch out: subtract from left to right, one step at a time.

排出正确的连减 = susun ayat tolak berturut-turut 判断方法：一、减号链最前面必须是四张卡里最长的时间，否则一开始就不够减；二、用加法检查：后面三张的时间加起来，要等于最前面那张。小时相加满二十四要进一天。 例子：6 天 − 1 天 − 2 天 = 3 天，因为 1 天 + 2 天 + 3 天 = 6 天。 注意：长的时间放在后面，就会出现“不够减”的情况，这样的算式不成立。

arrange the subtraction = susun ayat tolak berturut-turut First, the time at the front of the chain must be the longest of the four cards, or there is not enough to subtract from. Second, check by adding: the other three times together must equal the front card, regrouping 24 hours as a day. Example: 6 days − 1 day − 2 days = 3 days, because 1 day + 2 days + 3 days = 6 days. Watch out: if a longer time comes later in the chain, it cannot be taken away, so that sentence is false.