ADDITION AND SUBTRACTION 1. Count the fish. 2. If there were one more, how many would there be? 3. If there were one less, how many would there be? 4. How many are 3 and 1? 3 less 1? 5. Count the dots on this card. 6. If there were one more dot, how many dots would there be? 7. If there were one less, how many dots would there be? 8. How many are 5 and 1? 5 less 1? 9. How many dots are there on this card? 10. If there were one more, how many would there be? //. If there were one less, how many would there be? 12. How many are 7 and 1? 7 less 1? 13. How many dots are there on this card? 14. If there were one more, how many would there be? 15. If there were one less, how many would there be? /. How many are 2 and 2? 3. How many are 3 and 2? 4. How many are 5 less 2? ооо Q Q 5. We add 3 and 2 when we say 3 and 2 are 5, or 3 plus 2 equals 5. Five is the sum of 3 and 2. 6. The sign for and or plus is +. 7. The sign for are or equals is =. Thus, 3 + 2 = 5 means 3 and 2 are 5. 8. We subtract 2 from 5 when we say 5 less 2 are 3, or 5 minus 2 equals 3. Three is the difference between 5 and 2. 9. The sign for less or minus is Thus, 523 means 5 less 2 are 3. Find the following sums and differences by the given marks: 10. 4+2 3+3 |||||| //. 6-2 6-3 6-4 12. 5+2 4+3 ||||||| Study these until the sums can be called quickly: Study these until the differences can be called quickly : /. How many birds are 1 bird and 2 birds? 2. George has 4 marbles in one pocket and 3 in the other. How many marbles has he in both pockets? 3. There are 4 girls on one bench and 2 on another. many girls are there on both benches? How 4. Ruth picked 5 pinks and Belle picked 3. How many more did Ruth pick than Belle? 5. Frank jumped 8 feet and Walter 5 feet. How much did Frank beat Walter? 6. Lucy planted 7 flowers, but 2 of them died. How many of them lived? 7. Three pears and six pears are how many pears? 8. Ella paid 5 cents for an orange and 2 cents for a plum. How much did she spend? 9. Rosa is 10 years old and Emma is 7. How much older is Rosa than Emina? 10. How many are 9 birds less 4 birds? 8 //. How many roses are 4 roses and 5 roses? 6 = ? 12. How many are 10 pins less 8 pins? 7-4 = ? 13. Alice had 6 dresses and her aunt gave her 2 more. How many dresses did she then have? 14. How many more letters are there in the name Washington than in Davis? in Jefferson than in Lincoln? 15. Thomas has 5 fish on his string and George has 4. How many fish have both? 16. Lily bought 3 sticks of candy and Anna 3 sticks. How many sticks did both buy? 17. My pencil cost 8 cents and yours 4 cents. How much more did mine cost than yours? 18. Oscar had 8 oranges and ate 3 of them. How many had he left? 19. Maud lives 7 miles from town and Lulu 3 miles farther. How far does Lulu live from town? 20. How many are 6 pies less 2 pies? 8-7 = ? 21. Clara found 6 eggs and Hattie found 4. eggs did both together find? How 22. Four from 10 leaves how many? 3 from 7? 23. Mary has 8 books in one sack and 2 in another. How many books has she? 24. Agnes has 7 flowers in a vase and 2 in her hand. How many flowers has she? 25. Willie is 10 years old and Eddie is 2 years younger than Willie. How old is Eddie ? 26. A boy had 9 miles to go. After going 3 miles, how much farther had he to go? 27. How many are 5 books less 2 books? 6-4 =? 28. John has 4 marbles. How many would he have if he had 4 more? 29. I had 10 cents and gave 6 cents for a pound of sugar. How much had I left? 30. What number is 5 less than 7? 3 less than 10? 31. What number is 9 less than 10? 5 less than 9? 32. Lucy gave 5 cents for a pencil and 5 cents for a bottle of ink. How much did she spend? 33. There are 6 pigs in a pen. If 3 pigs are taken out, how many will be left? |