Lumira AcademyMaths / Number / 1.1 Arithmetic / Subtracting decimals
C1.6 / E1.6 · NON-CALCULATOR · SKILL 2
Exchange it. Then take away.
Not enough tenths? Exchange one whole for ten tenths. You change the pieces, not the amount.
0 / 3independent first-try streak
0 / 3application calculations passed
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Why does this matter?
If you cut 1.7 m from 4.2 m of ribbon, the pieces left measure 2.5 m. Exchanging one metre for ten tenths does not make the ribbon longer; it gives you smaller units in which to do the subtraction.
Original Cambridge-style material for 0580 (2025–2027). This skill covers non-negative decimal subtraction through hundredths; later skills extend Arithmetic. Calculation checks are not official Cambridge method marks.