78 MORE DIFFICULT SUBTRACTION There are 42 children in a schoolroom, of whom 19 are girls. How many boys are in the schoolroom? 42 19 23 You cannot take 9 from 2, so you must use 1 of the 4 tens, which leaves 3 tens. 1 ten (or 10 ones)+2 ones makes 12 ones. 12-9=3. Write the 3 under ones. 1 ten from 3 tens leaves 2 tens. Write the 2 under tens. There are 23 boys in the schoolroom. See if you understand how to get the correct answers for the subtraction examples worked out below. 1. There are 36 pupils in a certain class. Of those, 18 are boys. How many girls are in the class? 2. Mother bought 37 cents worth of meat. She gave the butcher 50 cents. How much change did she receive? 3. Dorothy had 35 pieces of candy, of which 19 were chocolates, the remainder peppermints. How many pieces were peppermints? 4. On a farm there are 43 horses and cows. There are 19 horses. How many cows are on the farm? 5. A farmer had 94 acres of land. He sold 36 acres. How many acres had he then? 6. John had a tablet of 48 pages. He used 19 pages for arithmetic. How many pages were left? 7. I gathered 82 nuts, and gave 37 of them to my brother. How many did I have left? 8. Harry had 73 marbles. He gave 28 to Carl. How many had he left? 9. A milkman delivered 94 quarts of milk on Wednesday, and 68 quarts on Thursday. How many more quarts did he deliver on Wednesday than on Thursday? 10. A park has 89 deer, and 48 monkeys. How many more deer are there than monkeys? 11. John weighs 82 pounds, and James weighs 67 pounds. What is the difference between their weights? 12. Tom saved 37 dollars one year, and 56 dollars the next year. How much more did he save the second year? 13. During one month James earned 34 dollars and spent 8 dollars. How much had he left? 14. Which is greater: 9+8+6 or 6+9+8? 80 742 415 327 MORE DIFFICULT SUBTRACTION 5 is more than 2. Take 1 ten from 4 tens which leaves 7 hundreds less 4 hundreds are 3 hundreds. Write 3 The difference is 327. 904 646 258 6 is greater than 4. There are no tens in 904, so we must take 1 hundred from 9 hundreds. That leaves 8 hundreds. 1 hundred equals 10 tens. 10 tens and 0 tens are 10 tens. 10 tens less 1 ten are 9 tens. 1 ten (or 10 ones) and 4 ones are 14 ones. 14 ones less 6 ones are 8 ones. Write 8 under ones. Write 5 under tens. are 2 hundreds. 9 tens less 4 tens are 5 tens. 8 hundreds less 6 hundreds hundreds. The difference is 258. Make the following subtractions: Write 2 under 1. Our library had 653 books, but 164 were destroyed by fire. How many remained? 2. Carl bought 125 Sunday papers. He sold 119 before ten o'clock. How many remained unsold at that time? 3. The population of a certain town was 7,828. It is now 2,619. What is the decrease in population? 4. How many years from 1861 to 1926? From 1812 to 1914? From 1897 to 1925? From 1893 to 1927? From 1775 to 1812? 5. A coal dealer bought 982 tons of coal. He sold 728 tons. How many tons had he left? 6. In a certain factory there are 843 people employed. During a coal strike 467 of this number were out of work. How many were still employed? NOTE TO TEACHER: See Suggestions to Teacher, Note 16. |