ADDITION AND SUBTRACTION OF WHOLE NUMBERS (1).pptx

ADDITION AND SUBTRACTION OF WHOLE NUMBERS (1).pptx

1.   January February March Child 28 34 56 Adult 59 ? 55 Senior 15 22 ? TOTAL ? 139 ? The table shows the number of people visiting an art museum over 3 months. What is the total number of people that visited the art museum in January? Compared to January, how many more children go to the museum in February? How many adults visited the museum in February? 16 more seniors visited in March than the number that visited in January and February combined. How many seniors visited the museum in March? Which month had the highest number of visitors?

2. ADDITION & SUBTRACTION

3. ADDITION - finding the total, or sum, by combining two or more numbers.

4. PROPERTIES OF ADDITION

5. 1. Order/ Commutative Property - The order of the numbers does not affect the sum.   If A and B represent 2 whole numbers, then A + B = B + A. Example: 4 + 2 = 6, 2 + 4 = 6, 2 + 4 = 4 + 2.

6. 2. Identity Property -the sum of any number and zero (0) is the number itself. Example: 56 + 0 = 56 19, 343 + 0 = 19 343

7. 3. Grouping/ Associative Property - when we add two or more numbers, the sum is not affected by the way the addends are grouped. EXAMPLES: (5 + 2) + 3 5 + (2 + 3) Thus, (5 + 2) + 3 = 5 + (2 + 3) (5 + 2) + 3 = 10, 5 + (2 + 3) = 10

8. SUBTRACTION - is the process of finding the difference between two numbers or taking one number from another.

9. a. The difference between two same numbers is always equal to 0. Example: 15 – 15 = 0 b. When we subtract zero (0) from number, the number remains the same. Example: 23 – 0 = 23

10. c. Addition is the inverse of subtraction. Example: 67 – 53 = 14 53 + 14 = 67

11. ACTIVITY! Answer the activity on your book, “Let’s Work Together A, B, and C on page 22 and 23. A. Fill in each box with the correct symbol. B. State each number represented by a. C. Use the appliance showcase in the box to answer the questions that follow.

12. ASSIGNMENT! Answer “On Your Own A and B” on page 24 A. Find the correct digit for each box. B. Cross two numbers in the tail of the given arrow that give the sum at the arrowhead.