The number of days in each month is thus found:

Thirty days hath September, April, June, and November; February hath twenty-eight alone, and all the rest have thirty-one. When the year can be divided by 4 without a remainder, it is Bissextile or Leap-Year, in which February hath 29 days,

MOTION.

Teacheth to collect numbers of different denominations into one total.

RULE. Arrange the numbers so that those of the same denomination may stand directly under each other, and draw a line under them.

Add the numbers in the lowest denomination together, and find how many units of the next higher denomination are contained in their sum.

Write down the remainder, and carry the units to the next higher denomination, and proceed thus to the end.

Teacheth to find the inequality between numbers of divers denominations

RULE Having arranged the numbers so that the smaller may stand under the greater; subtract each number in the lower line from that which stands above it, and write dowr the remainders.

When any of the lower denominations are greater than the upper, increase the upper number by as many as make one of the next higher denomination, from which take the figure in the lower line, and set down the remainder, carry one to the next number in the lower line, and subtract as before.