1. Partitioning & Grid Method for Multiplying Large Numbers

2. 23 x 6 = ? Partition: 20 x 6 and 3 x6 Answer: 120 + 18 = 136
Partitioning
23 x 6 = ? Partition: 20 x 6 and 3 x6 Answer: = 136
Now try these…
16 x 3
48 x 9
124 x 8
388 x 7

3. LG: I can use the grid method
Partition the numbers in your problem
Use grid multiplication to record your answers
Add all products to get your final answer.
Now try these…
17 x 4
26 x 5
13 x 9 9 10 90 3 27

4. LG: I can use the grid method
Partition the numbers
Use grid multiplication to record your answers
Add all products to get your final answer.
Now try these…
14 x 16
67 x 12
284 x 23
365 x 21
48 x 88 40 8 80
3200
640
320 64

5. LG: I can use efficient written methods to multiply large numbers
Estimate a rough answer to your multiplication problem.
Use the grid method to partition the numbers and multiply each section. Show all working out.
Use a calculator to check your answer.

6. LG: I can use efficient methods to multiply large numbers
For every problem you must: estimate, use grid method, and calculate check
23 x 34
58 x 97
47 x 18
84 x 20
532 x 25
684 x 83
641 x 30
783 x 55
6428 x 7
9317 x 3
7593 x 6
3064 x 9
26 x 5379
63 x 8315
90 x 7301
47 x 3096
Choose at least one problem to complete from each column to solve. Now create and solve your own. We would love to see a total of 10 problems (including the ones you have chosen from above). Challenge yourself!

7. Worded Problems-Grid Method
1) An oil reserve has 893 barrels of crude oil. Each barrel holds 42 litres of crude oil.
What is the total volume of crude oil in the reserve?
2) Mr Strobel produces paper bags for various uses. He received 37 orders for grocery bags in a week.
Each order was for 750 bags.
How many bags did My Strobel produce?

8. Worded Problems
Make 3 different worded to problems to challenge each other