Q1 MATH 4 WEEK 3 DAY 1-MULTIPLICATION.pptx

Q1 MATH 4 WEEK 3 DAY 1-MULTIPLICATION.pptx

1. Multiplication WEEK 3 DAY 1 Multiplies numbers up to three digits by numbers up to two digits without regrouping.

2. SAMPLE PROBLEM Rosalina M a n t uan o, d r e ssm a k e r for 45 ye a rs, beg an s e wing do ze ns o f colo r f u l masks us in g sc r ap f a bric and gave it away fo r f re e to he r n e ighbor s. All in all, sh e g ave 12 boxes with 214 p c s of fa ce m a sks i n e a c h b o x. How m a ny pi e c e s of face m asks d i d sh e s hare wi t h her n e i ghbor s ?

3. 214 214 214 214 214 214 214 214 214 214 214 214 12 boxes and each boxes has 214 face masks 214 x 12 = N

4. LONG METHOD STEP 1: Write the multiplicand and multiplier in expanded form. 214 = 200 + 10 + 4 12 = 10 + 2

5. LONG METHOD STEP 2: Multiply the digit in the ones place by the multiplicand, Then multiply the digit in tens place in the multiplicand 214 = (200 + 10 + 4) 10 214 = (200 + 10 + 4) 2 12 = 10 + 2

6. LONG METHOD STEP 2: 214 = (200 + 10 + 4) 10 214 = (200 + 10 + 4) 2 = (200x10) + (10x10) + (4x10) = (200x2) + (10x2) + (4x2)

7. LONG METHOD STEP 2: = (200x10) + (10x10) + (4x10) = (200x2) + (10x2) + (4x2)

8. LONG METHOD STEP 3: Add all the products. = (200x10) + (10x10) + (4x10) = (200x2) + (10x2) + (4x2) = 2000 + 100 + 40 = 400 + 20 +8

9. LONG METHOD STEP 3: Add all the products. = 2000 + 100 + 40 = 400 + 20 +8 = 2140 = 428

10. LONG METHOD STEP 3: Add all the products. 2 140 + 428 2 568 204 x 12 2 568

11. SHORT METHOD Th O T H 2 1 4 2 1 X 8 2 4 4 1 2 8 6 5 2 +

12. LONG METHOD 302 x 23 = N

13. LONG METHOD STEP 1: Write the multiplicand and multiplier in expanded form. 302 = 300 + 2 23 = 20 + 3

14. LONG METHOD STEP 2: Multiply the digit in the ones place by the multiplicand, Then multiply the digit in tens place in the multiplicand 302 = (300+2) 20 302 = (300+2) 3 23 = 20 + 3

15. LONG METHOD STEP 2: 302 = (300 + 2) 20 302 = (300 + 2) 3 = (300x20) + (2x20) = (300x3) + (2x3)

16. LONG METHOD STEP 2: = (300x20) + (2x20) = (300x3) + (2x3)

17. LONG METHOD STEP 3: Add all the products. = (300x20) + (2x20) = (300x3) + (2x3) = 6000 + 40 = 900 +6

18. LONG METHOD STEP 3: Add all the products. = 6000 + 40 = 900 +6 = 6 040 = 906

19. LONG METHOD STEP 3: Add all the products. 6 040 + 906 6 946 302 X 23 6 646

20. SHORT METHOD Th O T H 3 2 3 2 X 6 9 4 6 6 4 9 6 +