CLASS WORK 1. Express in figures: One million, one hundred and one thousand and one A) 1111 B) 11011 C) 1101100 D) 110101 E) 1111 2. How many digits are in the number 1002004? A) 3 B) 5 C) 6 D) 7 E) 8 3. Order from greatest to least the numbers 9,239,999 | 9,932,999 | 99,111,222 | 9,329,999 A) 9,239,999 | 9,932,999 | 99,111,222 | 9,329,999 B) 99,111,222 | 9,932,999 | 9,329,999 | 9,239,999 C) 99,111,222 | 9,932,999 | 9,239,999 | 9,329,999 D) 9,239,999 | 99,111,222 | 9,329,999| 9,932,999 4. Write 82,145,987 in word form. A) eighty-two, one hundred forty-five, nine eight seven B) eighty-two million, one hundred forty-five, nine hundred eighty seven C) eighty-two million, one hundred forty-five thousand, nine hundred eight-seven D) eighty-two million, one hundred forty-five thousand, nine hundred eighty-seven 5. If you switch the positions of the digits 3 and 5 in the number 3256, which statement is correct? A) the number does not change B) the number increases C) the number decreases D) the number has more digits ASSIGNMENT 1. What is the largest 9 digit number? a) 99999999 b) 9999999999 c) 999999999 d) 100000000 2. Write in figures: Fifty eight million, six hundred and twelve thousand, two hundred and sixty one 3. Write 5050050 in words 4. Express 317800291 5. Express 14012839 Class work Add these numbers together in each case: 1. 4726 and 3162 2. 35416 and 23164 3. 14053 and 23704 Home Work Find the sum of each of the following: 1. 4240 and 7350 2. 47086 and 957 3. 5200736 and 100399 Subtraction of Large Numbers Example 1: Find the difference between 7064 and 489. Solution: Example 2: Subtract 2413 from 6758 Solution: 6 7 5 8 - 2 4 1 3 4 3 4 5 Example 3: Solve 439782 – 249782 4 3 9 7 8 2 - 2 4 9 7 8 2 1 9 0 0 0 0 Class work Solve each of the following problem on subtraction: 1. 47847 – 26524 2. 38075 – 14061 3. 81570 – 68340 4. 77930 – 2610 QUESTIONS INVOLVING TWO OPERATIONS Example 1: Find the value of 3452 – 5143 + 2859 Solution Do the addition before subtraction 3 4 5 2 + 2 8 5 9 6 3 1 1 - 5 1 4 3 1 1 6 8 Example 2: Evaluate 3043 – 4185 + 5008 – 2909 Solution Rearrange first by considering addition first: 3043 + 5008 – 4185 - 2909 3 0 4 3 + 5 0 0 8 8 0 5 1 - 4 1 8 5 3 8 6 6 - 2 9 0 9 9 5 7 WORD PROBLEMS ON BASIC OPERATION Example 1: Mr. Musa needs 755280kg of animal feed a year to feed his cattle. He bought 462592kg of feed. How much more feed does he need to buy? Solution 7 5 5 2 8 0 kg - 4 6 2 5 9 2 kg 2 9 2 6 8 8 kg He needs to buy 292688 kg of feeds Example 2: Mrs. Jack bought 12500 bottles of drinks. She sold 3452 bottles last week and 2560 bottles this week. How many bottles had she left? Solution Total bottles sold = 3 4 5 2 +2 5 6 0 6 0 1 2 Bottles left = Bottles bought – bottles sold = 12500 – 6012 = 6488 bottles Class work 1. The population of a town is 198568. Out of them 45312 are men and 35678 are women. Find the number of children in the town. 2. A shopkeeper has 2425 boxes of 24 pencils each. How many pencils do all the boxes have in all? 3. Linda bought a coat for $2265 and a Sarah for $2150. She gave $5000 to the shopkeeper. How much money did the shopkeeper return to her? 4. Find the difference of the two sums, 14581 + 18541 and 23427 + 23243. 5. Find the sum of the two differences, 32309 – 23903 and 41724 – 31527.