划算
huá suàn · HSK 7
worthwhile
🧮 划 (plan/scratch) + 算 (calculate) = you ran the numbers and it pays off — worthwhile
划 — knife radical 刂 + 戈 (dagger-axe)
Originally written 劃, a semantic-phonetic compound: 刂 (knife) gives the meaning of cutting or marking, while 畫 supplied the sound and the sense of drawing lines. The simplified form 划 reuses an older character meaning to row a boat. Today it covers both senses: huá (to row, to scratch) and huà (to mark off, to plan).
算 — bamboo 竹 + abacus 具 (eye 目 + two hands 廾)
Originally depicted counting with bamboo rods on an abacus-like device. The top 竹 (bamboo) refers to the bamboo counting sticks used in ancient Chinese arithmetic, while the bottom shows hands manipulating them. The meaning broadened from 'to count' to 'to calculate' or 'to plan'.