Addition Pages 13 32 Pages 17 18 Adding

Addition Pages 13 - 32

Pages 17 – 18 Adding Larger Numbers v Parts of an Addition Problem 4 addend +5 addend 9 sum or total v Add the column at the right first, & then move to the next column to the left. v Continue until you have added each column of figures v To check an addition problem, you can add the numbers in each column from the bottom

Pages 17 – 18 Example 1) 7 +2 2) 9 +5

Pages 17 – 18 Group Work 1) 4 +4 2) 6 +5 5) 2 +4 6) 5 +0 3) 2 +3 4) 7 +1

Pages 19 – 22 Adding & Carrying v When the sum of the numbers in a column has a 2 -digit answer. Write the digit on the right under the column you just added & carry the left digit to the next column. v Writing a digit in the next column is sometimes called regrouping or renaming. It is also called carrying. The idea is to add units with units, tens with tens, hundreds with hundreds, & so on.

Pages 19 – 22 Example 1) 57 +83 2) 9 37 + 8

Pages 19 – 22 Group Work 1) 43 +29 2) 82 +68 3) 683 +417 4) 257 +683 5) 5 47 +8 6) 2 81 +5

Page 23 Adding Numbers Written Horizontally v When the numbers you want to add are not in vertical columns, rewrite them so that the units are under the units, the tens are under the tens, & so on. v Always line up the units column first.

Page 23 Example 1. 93 + 55 + 34 = 2. 4, 596 + 8, 892 + 4, 625 =

Page 23 Group Work 1. 53 + 618 + 9 + 47 = 2. 26 + 745 + 66 + 4, 329 = 3. 232 + 80, 465 + 19 + 1, 591 = 4. 8, 779 + 2, 286 + 5, 269 = 5. 7, 630 + 4, 108 + 7, 068 =

Page 24 Addition Shortcuts v compatible pairs = Two numbers whose sum ends in zero. v The numbers in an addition problem may be added in any order so look for any that make a compatible pairs. v Adding these will make your addition faster

Page 24 v Find Example a compatible pair. Rewrite the problem. Then add. 1. 62 + 8 + 5 = 2. 17 + 11 + 5 + 9 + 3 =

Page 24 v Find Group Work a compatible pair. Rewrite the problem. Then add. 1. 19 + 27 + 3 = 2. 12 + 9 + 6 + 21 + 8 = 3. 4 + 35 + 13 + 26 + 5 = 4. 21 + 14 + 42 + 8 + 6 = 5. 43 + 7 + 8 + 62 + 5 =

Pages 25 – 26 Rounding, Estimating, & Using a Calculator v When the digit to the right of the number you are rounding to is greater than or equal to 5, you must add 1 to the underlined digit. v If the underlined digit is a 9, the digit to the left of the 9 changes.

Pages 25 – 26 Example v Round each number to the nearest hundred. Then add the rounded numbers. 1. 3, 948 + 758 + 6, 799 + 437 = 2. 714 + 7, 465 + 302 + 4, 974 =

Pages 25 – 26 v Round Group Work each number to the nearest hundred & find the sum of the rounded numbers. Then find the exact sum of the original numbers. 1. 518 + 782 + 764 + 207 + 843 = 2. 114 + 2, 726 + 3, 953 + 199 + 4, 727 = 3. 6, 806 + 992 + 5, 528 + 4, 666 + 894 =

27 – 26 Applying Your Pages Addition Skills v Watch v In for words such as sum, total, & combined solving money problems, be sure to add dollars in the dollars columns & cents in the cents columns.