[007 Rh/S] Rhifedd: Talgrynnu i'r 10, 100 neu i'r 1,000 agosaf
Eglurhad o sut i dalgrynnu unrhyw rif i'r 10 agosaf, i'r 100 agosaf neu i'r 1,000 agosaf. (Lefel 3.)
Unfortunately not the ones with chocolate chips.
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