# Rapid Calculations

Gregg, 1925 - Arithmetic - 224 pages

### Contents

 CHAPTER I 15 SECTION 20 ac 26 CHAPTER II 27 CHAPTER III 41 SIMPLE DIVISION 52 CHAPTER V 66 CHAPTER VII 85
 PRACTICE 132 CHAPTER XI 138 CHAPTER XII 145 ij Profit and Loss 157 CHAPTER XIII 164 MISCELLANEOUS PROBLEMS 176 138 188 50 205

 1 Cube Root Mental Method Applicable 98 g Decimalisation of Money 113
 Easter Sunday 214 df 218

### 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.