PRACTICE ON HARDER SUBTRACTION 137 104. Extra Practice on Harder Subtraction. (WRITTEN WORK.) Copy and subtract in the examples Check your work. below. SUBTRACTION WITH LARGER NUMBERS 105. Some Lower Figures Smaller Than Upper Figures. Zeros. (WRITTEN WORK.) Study the sample. Then copy and subtract in the examples below. Check your work. Sample 395 21 374 Don't let an example like this one bother you. When there are two figures in the lower number and three figures in the upper number, you subtract just as you would if there were three figures in the number below. In the sample there is nothing to subtract from the 3; so you write it in the answer. REVIEW OF ADDITION FACTS 139 (CLASS WORK.) 106. Review of Addition Facts. Give the sums in the wheels below. Add the number in the center to each number around it. Start where the arrow points and go around to the right. Just give the answers. You would say the answers this way for Circle (A): 8, 19, 2, 21, and so on. Raise your hand if you hear a mistake. NEW WORK BORROWING IN SUBTRACTION 107. Some Lower Figures Larger Than Upper Figures. No Zeros. (WRITTEN WORK.) Can you work these problems and examples? 1. A man was carrying sacks of flour out of a car. When he started to work in the morning, there were 326 sacks of flour in the car. By noon he had carried out 152. How many were left in the car? 326 152 HINTS: (a) You can get the answer if you remember what you have already studied about subtraction. (b) Write these numbers on a piece of paper. (c) To subtract 2 from 6 is easy. Do it. (d) Now be careful. Do you know what to do in the tens' column? (e) When you make the last subtraction, remember what to do in the hundreds' column. (f) Name your answer; then check it. Subtract: 2. $6.17 3. $7.49 4. $8.38 5. 874 6. 779 7. 967 8. A girl wanted to buy a doll that cost $3.45. She had only $2.28. How much more money did she need? $ HINTS: (a) On your paper put the right figures where the blanks are. (b) Remember what to do with the cents' points and the $. (c) Look out for the first subtraction. (d) What is your answer? Did you remember the $? adding you sometimes had to carry more than once in the same example? Sometimes you have to borrow more than once in subtraction examples. You need to know how to borrow more than once in getting the answer to the problem below. 1. A fat man in a circus weighs 536 pounds. Fred's father weighs 189 pounds. How much more than Fred's father does the fat man weigh? This is the way to work the problem: Borrow M 536 189 347 pounds (a) Take 1, or borrow, from the 3 and increase the 6 to 16. (b) 9 from 16 leaves 7. Write the 7. (c) Remember that you took 1 away from the 3, leaving only 2 where the 3 is in the example at the left. (d) Take 1 from the 5 and increase the 2 (e) 8 from 12 leaves 4. Write the 4. (h) Check to see if the answer is correct. 5 2'6 189 7 4'2'6 189 347 |