Convert First; the Scale Is Part of the Number

Raw arithmetic on mismatched units or an ignored axis scale produces a clean-looking wrong answer; the fix is to convert before you compute and to read the scale label as part of every value. Watch the two traps freeze frame by frame — the rate that multiplies minutes, and the bar read without its scale — each struck in red beside the number that reads its whole label.

8 STEPS · 6 QUICK CHECKS · convert before the arithmetic · read the scale · v1