## Rapid Calculations |

### Common terms and phrases

11 leaves 13 cwts 9 equals acres added April average calculations carry casting out 3's Casting out Elevens casting out nines centimetre cents circumference column compound interest cube cube roots days after 22nd Decimalisation deduct Discount divided by 11 divisor doubled drms Duodecimals Easter Sunday EXERCISE 15 farthings figures add Find the area Find the cost Find the L.C.M. Find the remainder Find the square Find the value francs galls inches Index Numbers last example marked price mentally method metre minutes mixed Monday months multiply noughts and divide obtained pence perimeter primes profit quickest quotient range of numbers Recurring Decimals Reduce result ROTHAMSTED EXPERIMENTAL STATION selling price separate numbers September 1752 shares Similarly Simple Interest square root subtraction tens figures Thursday tons unit figure Vulgar Fractions whole number worth Write yards zoids

### Popular passages

Page 127 - Dry Measure 2 pints 1 quart 8 quarts 1 peck 4 pecks 1 bushel...

Page 52 - When a decimal number is to be divided by 10, 100, 1000, &c., remove the decimal point as many places to the left as there are ciphers in the divisor, and if there be not figures enough in the number, prefix ciphers.

Page 124 - LENGTH. 12 Inches .................... 1 foot. 3 Feet ...................... 1 yard. 5£ Yards ................... 1 rod, pole, or perch. 40 Poles ..................... 1 furlong. 8 Furlongs, or 1,760 yds, 1 mile.

Page 52 - ... form a number divisible by 8 9 if the sum of its digits is divisible by 9 10 if it ends in 0 The divisibility rule for 7 is complicated.

Page 52 - ... is divisible by 8. 9 If the sum of the digits is divisible by 9, then the number is divisible by 9.

Page 183 - If A and B together can do a piece of work in 8 days, A and C together in 9 days, and B and C in ten days ; how many days would it take each to perform the same work alone ? Ans.

Page 53 - A number is divisible by 11 if the sum of the digits in the even places equals the sum of the digits in the odd places, or if the difference between these two sums is 11 or a multiple of 11.

Page 208 - Saturday 1 Friday 2 Saturday 3 SUNDAY 4 Monday 5 Tuesday 6 Wednesday 7 Thursday 8 Friday 9 Saturday 10 SUNDAY 11 Monday 12 Tuesday 13 Wednesday 14 Thursday 15 Friday 16 Saturday 17 SUNDAY...

Page 212 - SUNDAY 1 Saturday 2 SUNDAY 3 Monday 4 Tuesday 5 Wednesday 6 Thursday 7 Friday 8 Saturday 9 SUNDAY 10 Monday 11 Tuesday 12 Wednesday 13 Thursday 14 Friday 15 Saturday 16 SUNDAY 17 Monday 18 Tuesday 19 Wednesday 20 Thursday 21 Friday 22 Saturday 23 SUNDAY 24 Monday 25 Tuesday 26 Wednesday 27 Thursday 28 Friday 29 Saturday 30...

Page 188 - ... opposite angle, be formed into two right angles. 43. Hence the area of every oblique-angled triangle is just half as much as the area of that square or rectangle, whose length and breadth are equal to the longest side and perpendicular of the triangle. RULES FOR FINDING THE AREAS OF SUPERFICES. 44. To find the area of a square or rectangle. — Multiply the length by the breadth. 45. To find the area of a rhomboid or rhombus. — Multiply its length by its perpendicular height.