# A treatise on mental arithmetic, in theory and practice

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### Δημοφιλή αποσπάσματα

Σελίδα 16 - OF TIME. 60 Seconds = 1 Minute 60 Minutes = 1 Hour 24 Hours = 1 Day 7 Days = 1 Week 28 Days = 1 Lunar Month...
Σελίδα 12 - Square Measure 144 square inches = 1 square foot 9 square feet = 1 square yard...
Σελίδα 19 - MEASURE. 10 millimetres = 1 centimetre. 10 centimetres = 1 decimetre. 10 decimetres = 1 metre. 10 metres = 1 decametre. 10 decametres = 1 hectometre. 10 hectometres = 1 kilometre.
Σελίδα 85 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.
Σελίδα 19 - English cubic inches. 10 millilitres . . = 1 centilitre; 10 centilitres . . = 1 decilitre; 10 decilitres . . =1 LITRE; 10 Litres . . =1 decalitre; 10 decalitres . . = 1 hectolitre; 10 hectolitres . =1 chilolitre; 10 chilolitres . . =1 myrialitre.
Σελίδα 17 - Thirty days hath September, April, June, and November; February hath twenty-eight alone, And all the rest have thirty-one, Except in leap year, at which time February's days are twenty-nine.
Σελίδα 8 - MONEY. 4 farthings = 1 penny. 12 pence = 1 shilling. 20 shillings = 1 pound.
Σελίδα 87 - If 9 men can do a piece of work in 8 days, how long will it take one man to do the same work ? 4.
Σελίδα 16 - The months of the year are: January, February, March, April, May, June, July, August, September, October, November, December.
Σελίδα 88 - How many days' work can 9 men do in 24 days ? 31. How many days will it take 1 man to perform a piece of work, that 9 men will perform in 24 days ? 32 How many days will it take 1 man to build a piece of road, that 13 men can build in 47 days ? 33. How many men must be employed to do a piece of work in 1 day, that 11 men can perform in 18 days ? 34.