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cbois66 t1_je927kw wrote on March 30, 2023 at 8:50 AM

Reply to comment by Skywire2000 in All odd numbers have the letter E in them. by EgonVector

If the number is still whole when divided by 2, it is even. 30 and 50 are even because 30 ÷ 2=15 and 50 ÷ 2=25. Now 31 and 51 are odd because 31 ÷ 2=15.5 and 51 ÷ 2=25.5. The outcomes are not whole, so the numbers are odd.