Number Sense Tricks
... a. 3 digit or 4 digit (work in pairs): subtract first and last digit/pair, then multiply by 100 and subtract difference i. 634-436 = 198 (6-4 = 2, 100x2 – 2 = 198) ii. 1495-9514 = -8019 (95-14=81, 81x100-81 = 8019, make negative) b. 4 digit number: subtract first and last digit, then multiply by 100 ...
... a. 3 digit or 4 digit (work in pairs): subtract first and last digit/pair, then multiply by 100 and subtract difference i. 634-436 = 198 (6-4 = 2, 100x2 – 2 = 198) ii. 1495-9514 = -8019 (95-14=81, 81x100-81 = 8019, make negative) b. 4 digit number: subtract first and last digit, then multiply by 100 ...
允許學生個人、非營利性的圖書館或公立學校合理使用 本
... 20. In this diagram there are four lines with three circles each. Place the numbers from 1 to 7 into the circles, so that each line adds up to 12. Which number must go into the circle at the centre of the diagram? (A) 7 (B) 6 (C) 5 (D) 4 (E) 2 Questions 21 to 25, 5 marks each 21. Four hockey teams p ...
... 20. In this diagram there are four lines with three circles each. Place the numbers from 1 to 7 into the circles, so that each line adds up to 12. Which number must go into the circle at the centre of the diagram? (A) 7 (B) 6 (C) 5 (D) 4 (E) 2 Questions 21 to 25, 5 marks each 21. Four hockey teams p ...
Potpourri - Blaine School District
... of the rectangle must be at least 36. Thus the dimensions of the rectangle must be 69 by 61, making its perimeter 260 . 5. Every factor n ≤ 5 can be paired with the factor m = 30 so that mn = 30 in each pair. Thus n the product of all eight factors is 304 = (1 · 30) (2 · 15) (3 · 10) (5 · 6), so k = ...
... of the rectangle must be at least 36. Thus the dimensions of the rectangle must be 69 by 61, making its perimeter 260 . 5. Every factor n ≤ 5 can be paired with the factor m = 30 so that mn = 30 in each pair. Thus n the product of all eight factors is 304 = (1 · 30) (2 · 15) (3 · 10) (5 · 6), so k = ...
Sprint Round
... numbers that are visible. What is the largest number that is certain to divide P ? 15. The digits 0, 1, 2, and 3 are used to replace a, b, c and d in the expression c · ab − d. What is the maximum possible value of the result? 16. A scout troop buys 1000 candy bars at a price of five for $2. They se ...
... numbers that are visible. What is the largest number that is certain to divide P ? 15. The digits 0, 1, 2, and 3 are used to replace a, b, c and d in the expression c · ab − d. What is the maximum possible value of the result? 16. A scout troop buys 1000 candy bars at a price of five for $2. They se ...
Elementary arithmetic
Elementary arithmetic is the simplified portion of arithmetic that includes the operations of addition, subtraction, multiplication, and division. It should not be confused with elementary function arithmetic.Elementary arithmetic starts with the natural numbers and the written symbols (digits) that represent them. The process for combining a pair of these numbers with the four basic operations traditionally relies on memorized results for small values of numbers, including the contents of a multiplication table to assist with multiplication and division.Elementary arithmetic also includes fractions and negative numbers, which can be represented on a number line.