Santai Minda

Kenal operasi = 认出四种运算
先读题目的关键词和数字关系，再决定用加、减、乘还是除。“一共、合起来”多用加法，“剩下、相差”用减法。“每组一样”用乘法，“平均分”用除法。
例子：“每排 6 张椅子，共 5 排，一共几张？”是乘法：5 × 6 = 30 张。
注意：关键词只是提示，还要想故事的真正意思再决定。

Kenal operasi = Recognise the four operations
Read the key words and how the numbers relate, then choose add, subtract, multiply or divide. 'Altogether' often means add, and 'left' or 'difference' means subtract. 'Equal groups' means multiply, and 'shared equally' means divide.
Example: 'There are 5 rows of 6 chairs. How many chairs?' This is multiplication: 5 × 6 = 30 chairs.
Watch out: Key words are only hints; think about what really happens in the story.

Strategi sesuai = 合适的策略
不同的题目用不同的方法算。三位数加减用直式，乘除用乘法表，小的跳数可以用数线，平均分可以画分组模型。选对方法，算得又快又准。
例子：用数线算 52 − 8：从 52 往回跳 2 到 50，再跳 6 到 44，所以 52 − 8 = 44。
注意：直式计算时，个位、十位、百位要上下对齐。

Strategi sesuai = A suitable strategy
Different questions suit different methods. Use column form for three-digit adding and subtracting, times tables for multiplying and dividing, a number line for small jumps, and group drawings for sharing. The right method makes the work quick and accurate.
Example: On a number line, 52 − 8: jump back 2 to 50, then 6 more to 44, so 52 − 8 = 44.
Watch out: In column form, line up the ones, tens and hundreds digits exactly.

Semak kewajaran = 检查是否合理
答完题后用估算或相反的运算来检查。加法可以用减法检查，乘法可以用除法检查。估算就是把数凑成整十整百来比较。
例子：398 + 205 = 603，估算 400 + 200 = 600；再检查 603 − 205 = 398。
注意：用同一种算法重算，容易犯同样的错。

Semak kewajaran = Check if it makes sense
After answering, check with an estimate or the opposite operation. Addition can be checked with subtraction, and multiplication with division. To estimate, round to the nearest hundred or ten and see whether your answer is close.
Example: 398 + 205 = 603. Estimate: 400 + 200 = 600, which is close. Then check 603 − 205 = 398.
Watch out: Use the opposite operation to check; redoing the same steps can repeat the same mistake.