Copy and add the following: 3+4+246 2+4+2+3 2+6+8+4 2--6-147 88-4-2-5 5+2+7+6 9+2+6+3 5+2+7+6 9+1+4+2 4+2+6+7 88+7+2+2 6+2+3+5 4+7+2+6 4+7+5+4 8+2+2+7 7+7+2+3 1. Make two marks on your slates. Erase one. How many marks are there left? 2. 1 mark from 2 marks leaves how many marks? 3. If there were 3 pencils on the table, and Helen took 1 away, how many were left? 4. How many are 3 pencils less 1 pencil ? 5. If 4 apples were put in a box, and afterward 1 was taken out, how many remained ? 6. How many are 4 apples less 1 apple ? 7. Hold up 5 fingers. Put one down. How many fingers are you holding up? 8. How many are 5 fingers less 1 finger? How many are there left ? 10. How many are 6 dots less 1 dot? 11. How many steamships are represented in the picture ? 12. If 1 sails away, how many are left? 13. How many vessels are 7 vessels less 1 vessel ? 14. How many boats do you see in the picture? 15. How many are being rowed away? How many are left? 16. How many boats are 8 boats less 1 boat? 17. If there are 9 trees, and a man cuts 1 down, how many will be left? 18. How many trees are 9 trees less 1 tree? LESSON XX. 1. A rose-bush had 3 roses on it, but 1 dropped off. How many roses were there left on the bush ? 2. How many are 3 less 2? 3. Make 4 marks. Erase 2. How many are left? 4. How many marks are 4 marks less 2 marks? 5. Helen had 5 pennies, and gave 2 to a beggar. How many had 'she left ? 6. How many are 5 less 2? takes the place of the word less. It is read minus. Thus, 4 less 2 equals 2, is written 4—2=2, and is read 4 minus 2 equals 2? 7. If you take 2 apples from a group of 6 apples, how many apples will be left? 8. How many apples are 6 apples less 2 apples ? 9. Express 6 less 2 equals 4. 6—2=4. The sign 10. William had 7 pennies, and gave 2 for a pencil. How many had he left? 7—2=? 11. How many slates are 8 slates less 2 slates ? 12. How many are 9 less 2? How many are 10 less 2? How many are 11 less 2? 13. How many are 12 dollars less 2 dollars ? Taking one number from another is called Subtraction. 14. Form the subtraction tables of ones and twos. TABLES. 1—1=0 6—1=5 2-1 = 1 7—1=6 3—1=2 8—1=7 4-1=3 9—1=8 5—1=4 10—1=9 2-2=0 7--2=5 3-2=1 8—256 4-2=2 9-2=7 5-2=3 10—2=8 6—2=4 11 2=9 LESSON XXI. 1. Helen had 3 cents, and gave them for a pencil. How many cents had she left? 3-3=? 2. A man had 4 horses, and sold 3 of them. How many had he left? 4-3=? 3. How many cows are 5 cows less 3 cows ? 4. A boy had 6 marbles, and gave away 3. How many marbles had he left ? 6—3=? 5. How many dollars are 7 dollars less 3 dollars ? How many are 8 less 3 ? 6. A woman had 9 dollars, and gave 3 for a hat. How many dollars had she left? 7. How many horses are 10 horses less 3 horses ? How many are 11 minus 3 ? 8. If there were 12 pigeons on a limb, and 3 flew away, how many remained? 12-3=? 9. If James had 4 apples, and gave away 4, how many had he left? 4-4=? 10. If Emily had 5 cents, and gave 4 cents for paper, how many cents had she left? 11. How many are 6 less 4? 7 minus 4 are how many ? 12. How many are 8 less 4? 9 minus 4 are how many y? 13. How many are 10 books less 4 books? 11 hats less 4 hats ? 14. How many are 12 minus 4? 13 less 4 are how many ? 15. Form the subtraction tables of threes and fours. TABLES. 3—3=0 8--3=5 4-3=1 9 3=6 5-3=2 10—3=7 6-3=3 11—3=8 7—3=4 12—3=9 4–4=0 9-455 5-4=1 10—4=6 6-452 11-457 7-4=3 12–4=8 8—4=4 13—4=9 |