Stacy multiplied 5x9 and said the answer was 44.what two patterns could you use to show that her answer is not correct?
Multiples of 5 end in 5 or 0.
The digits of multiples of 9 add up to 9.
he can use the finger trick ad count by 5's or he can think as it 9x6 but swicth the numbers around.
To show that Stacy's answer is not correct, we can use two different patterns: the multiplication pattern and the multiplication table pattern.
1. Multiplication Pattern:
To find the product of two numbers, we multiply the corresponding digits and then add up the results. In this case, Stacy multiplied 5 with 9. Let's calculate it:
5 x 9 = 45
As you can see, the correct product of 5 and 9 is 45, which is different from Stacy's answer of 44. By using the multiplication pattern, we can see that her answer is not correct.
2. Multiplication Table Pattern:
Another way to verify Stacy's answer is to use a multiplication table. By referring to the multiplication table, we can cross-check whether Stacy's answer aligns with the given numbers.
The multiplication table for numbers up to 10x10 would look like this:
| x | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|----|---|---|---|---|---|---|---|---|---|----|
| 1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 2 | 2 | 4 | 6 | 8 | 10| 12| 14| 16| 18| 20 |
| 3 | 3 | 6 | 9 | 12| 15| 18| 21| 24| 27| 30 |
| 4 | 4 | 8 | 12| 16| 20| 24| 28| 32| 36| 40 |
| 5 | 5 | 10| 15| 20| 25| 30| 35| 40| 45| 50 |
| 6 | 6 | 12| 18| 24| 30| 36| 42| 48| 54| 60 |
| 7 | 7 | 14| 21| 28| 35| 42| 49| 56| 63| 70 |
| 8 | 8 | 16| 24| 32| 40| 48| 56| 64| 72| 80 |
| 9 | 9 | 18| 27| 36| 45| 54| 63| 72| 81| 90 |
| 10 | 10| 20| 30| 40| 50| 60| 70| 80| 90| 100|
Looking at the row for 5 and the column for 9, we can find the corresponding cell, which is 45. This confirms that Stacy's answer of 44 is not correct according to the multiplication table pattern.
By analyzing both the multiplication pattern and the multiplication table pattern, we can conclude that Stacy's answer of 44 for 5 multiplied by 9 is not correct.