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质量相减 = tolak jisim 公斤和公斤、克和克对齐。先减克：上面的克比下面少，就向公斤借一公斤，换成一千克加到克那一栏，公斤少一；再减克，最后减公斤。 例子：6 kg 100 g − 2 kg 400 g → 5 kg 1 100 g − 2 kg 400 g → 3 kg 700 g。 注意：借一公斤是一千克，不是一百克。

subtracting mass = tolak jisim Line up kilograms with kilograms and grams with grams. Subtract the grams first; if the top grams are fewer, borrow 1 kg as 1 000 g, add it to the grams and take 1 from the kilograms. Then subtract the grams and the kilograms. Example: 6 kg 100 g − 2 kg 400 g → 5 kg 1 100 g − 2 kg 400 g → 3 kg 700 g. Watch out: borrowing 1 kg gives 1 000 g, not 100 g.

容量乘法 = darab isi padu 用乘数分别乘毫升和升。毫升的积如果满一千，就换出一升加到升那一栏，毫升栏只留下不满一千的部分。 例子：4 × 1 ℓ 300 mℓ → 4 ℓ 1 200 mℓ → 5 ℓ 200 mℓ。 注意：写成升和毫升时，毫升部分要占三个位置，满一千的部分一定要换成升。

multiplying volume = darab isi padu Multiply the millilitres and the litres by the number. If the mℓ product reaches 1 000, change 1 000 mℓ into 1 ℓ in the litres column and keep only the part under 1 000 as mℓ. Example: 4 × 1 ℓ 300 mℓ → 4 ℓ 1 200 mℓ → 5 ℓ 200 mℓ. Watch out: the mℓ part takes three places, and any 1 000 mℓ must be changed into litres.

长度除法换单位 = bahagi dan tukar unit 题目要毫米，可以先把厘米化成毫米：厘米乘十；再除以除数。也可以先除，得到厘米，再乘十化成毫米。两种方法结果一样。 例子：18 cm ÷ 3 → 180 mm ÷ 3 = 60 mm。 注意：一厘米是十毫米，不是一百毫米。

divide and change units = bahagi dan tukar unit The question wants millimetres, so change the centimetres first (cm × 10) and then divide. Or divide first to get centimetres and then multiply by 10. Both ways agree. Example: 18 cm ÷ 3 → 180 mm ÷ 3 = 60 mm. Watch out: 1 cm is 10 mm, not 100 mm.