一五一十 yīwǔyīshí to count by fives Origin Definitions Defs Strokes Stroke Words Sentences Sents 一 yī numeral one one; the number 1; single; alone五 wǔ numeral five the number five; 5一 yī numeral one one; the number 1; single; alone十 shí numeral ten the number ten; 10