1. How To Use MrV’s Sums Table For Addition Table Terminology Adding Two 1-Digit Numbers Adding a 1-Digit Number to a Longer Number Handling Zeroes in Addition

2. There are 9 table Rows, Row 1 through Row 9 Each Row has 10 Cells, Cell 0 thru Cell 9. Each Cell holds 3 numbers: The Sum (big number) and its 2 Addends Sums Table Terminology: Row, Cell, Addends, Sum For example, this is Row 5: For example, this is Cell 6 in Row 5. In this Cell, the Sum is 11 and the Addends are 5 + 6. 5 6

3. 7 + 8=? 1. Find the Row for the first Addend 2. Look across the Row until you see both Addends on the bottom 3. The big number above them is their Sum 15 Adding Two 1-digit Numbers 7 + 8 In this case, it’s Row 7: In this case, it’s 7 + 8 7 plus 8 is 15

4. Ok, let’s try a few: Click when you find the Sum 7 + 9= 5 + 6= 9 + 4= 3 + 8= 7 + 9 5 + 6 9 + 4 3 + 8 16 11 13 11

5. Two-step Adding Most people know simple sums like: 3 + 4 = 7 and adding a digit to numbers that end in 0: 20 + 7 = 27 So 42 + 3 = 40 + 2 + 3 = 40 + 5 = 45 but, WHY? You try: 26 + 3 = 20 + 9 = 29 7 + 61 = 60 + 8 = 68 Sometimes, there is a Carry: 34 + 7 = 30 + 11 = 41 You try: 79 + 5 = 70 + 14 = 84 6 + 38 = 30 + 14 = 44 8 + 22 = 20 + 10 = 30 95 + 8 = 90 + 13 = 103

6. 25 + 9=? 1. Find the Row: Use 1 st Addend’s units digit 3. Add the Addend’s tens digit to the tens digit of the Sum (do in your head) Adding a 1-digit Number to any 2-digit Number 5 + 9 In this case, it’s Row 5: 2 added to the tens digit of 14 makes 34 the Final Sum 2. Find the sum of the Addend units digits In this case, it’s 5 + 9 = 14 14 +2 = 34