Unit 31
Akal Pintar
Bandingkan:
875 × 248 dan 875 × 217
Apakah kesimpulan kamu?
比较两个算式 = banding dua ayat matematik
两个算式都是 875 先乘一个数再除以一个数，只是乘数和除数不同。不必真的把大数算出来，先约简看看，就能发现它们有什么关系，再说出结论。
例子：100 × 6 ÷ 3 和 100 × 4 ÷ 2 → 都是 100 × 2。
注意：结论要说出“为什么”相等或不相等。
compare two number sentences = banding dua ayat matematik
Both sentences multiply 875 by a number and then divide by another; only those two numbers are different. We do not need to work out the big products; simplify first to see how they are related, then state a conclusion.
Example: 100 × 6 ÷ 3 and 100 × 4 ÷ 2 are both 100 × 2.
Watch out: a conclusion should explain why they are equal or not.
Permudahkan
Permudahkan kedua-duanya
24 ÷ 8 = 3 · 21 ÷ 7 = 3
875 × 24 38 1 = 875 × 3 = 2 625
875 ×21 37 1 = 875 × 3 = 2 625
875 ×
先约简 = permudahkan dahulu
第一个算式里 24 ÷ 8 = 3，第二个算式里 21 ÷ 7 = 3，两个都变成 875 × 3 = 2 625。这样只做一次简单的乘法就能比较。
例子：900 × 12 ÷ 4 和 900 × 6 ÷ 2 都是 900 × 3 = 2 700。
注意：约简时乘数和除数要除以同一个数。
simplify first = permudahkan dahulu
In the first sentence 24 ÷ 8 = 3, and in the second 21 ÷ 7 = 3, so both become 875 × 3 = 2 625. One simple multiplication is enough to compare them.
Example: 900 × 12 ÷ 4 and 900 × 6 ÷ 2 are both 900 × 3 = 2 700.
Watch out: divide the multiplier and the divisor by the same number.
Kesimpulan
Apakah kesimpulan yang betul?
说出结论 = nyatakan kesimpulan
判断两个乘除算式谁大，要把乘数和除数放在一起看：先各自约简，看每个算式最后等于被乘数乘几。约简后的数一样，结果就一样；约简后的数比较大，那个算式就比较大。只看其中一个数比较大，是不够的。
例子：60 × 9 ÷ 3 和 60 × 8 ÷ 2 → 60 × 3 和 60 × 4，后面那个比较大。
注意：结论要写出理由，也就是约简后得到的数。
state the conclusion = nyatakan kesimpulan
To judge which sentence is bigger, look at the multiplier and the divisor together: simplify each and see what the first number is finally multiplied by. If those numbers match, the results match; the bigger number gives the bigger sentence. Looking at just one bigger number is not enough.
Example: 60 × 9 ÷ 3 and 60 × 8 ÷ 2 become 60 × 3 and 60 × 4, so the second is bigger.
Watch out: a conclusion should give the reason, which is the number you get after simplifying.
Ringkasan