13 and 17/21
one sixteenth
5
5/6
two fourths equals one half two eighths equals one quarter one half plus one quarter is three quarters. Or, two fourths equals four eighths four eighths plus two eighths equals six eighths six eighths equals three quarters.
three plus one tenth plus six thousandths equals three and one hundred and six thousandths
one third, six eighteenths, twelve thirtysixths...
seven and seven twelfth
Three plus six equals nine.
1 and 1/6
12 and one twelth
8 - 1 = 7