i don't know if i got this right. but what i did for the cm was i put 10 in the missing spot because if i add 1+10+5 i get 16cm so thats what i put there and for my mm (the part that i really think i didn't right) was i put 50+100+10 the reason why i did that was because u have to get up to 16cm so know that 10mm is 1 cm so i added that so i could get 16. for example 50mm= 5cm so that how i did this.
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