Question

Sarah needs to find the product of 5 x 9. She knows that 5 x 4 = 20 and 5 x 5 = 25. How can she use that information to find the product of 5 x 9?

Answer 1

she can use that information by adding the last number 4 and 5 after that also add the answer 20 and 25 . By this method you can find the product of 5x9

Answer 2

Sarah can find the product of 5 x 9 by adding the two known products she has: 5 x 4 (which is 20) and 5 x 5 (which is 25) to get 45, which is the product of 5 x 9.

Step-by-step explanation:

Sarah can use the multiplication facts she knows, 5 x 4 = 20 and 5 x 5 = 25, to find the product of 5 x 9. To do this, she can add these two products together, since 4 + 5 equals 9. Therefore:

• First, add 20 (the product of 5 x 4) to 25 (the product of 5 x 5).
• The sum is 45.
• Since 20 represents 5 x 4 and 25 represents 5 x 5, their sum represents 5 x (4 + 5), which is 5 x 9.

So, the product of 5 x 9 is 45.