49. Further Practice on Adding by Endings. (ORAL WORK.) The examples in this article are harder than the ones on page 59. You must watch two things: Study Examples (A), (B), and (C). Do you see that the endings are all the same? When you add 6 and 6, the sum always ends with 2, doesn't it? The numbers that the arrows point to are the ones 50. Preparation for Harder Column Addition-Group II. (ORAL PRACTICE.) Tell where 16+4 is used in Row 1 on page 64. Do you see that you will need to learn the facts in Columns (A) to (E) below, if you want to give the sums in Rows 1 to 5 as quickly as you should? These are harder than the ones on page 60, but you can learn to say them just as fast, can't you? 51. Practice on Column Addition- Group II. (ORAL PRACTICE.) Try hard to do the work in this exercise without mistakes. HARDER COLUMN ADDITION 65 52. Preparation for Column Addition-Group III. (ORAL PRACTICE.) Look at Column (B). Do you see the two examples with the arrows pointing to them? Find in Row 2, page 66, the example in which these two examples are used. Can you add the rows very easily if you don't know the answers to the examples in (A), (B), (C), and (D) below? |