Multiplying with Multiples of 10

Hi Grade 5s!

Today in class we looked at patterns formed when multiplying multiples of 10. We know a number is a multiple of 10 when it ends with a 0.
We started the lesson by finding the products for the following questions:

25 x 10 = ?

25 x 100 = ?

25 x 1000 = ?
Then we used the knowledge we got from the pattern to figure out what 25 x 100,000 would be.
We figured out that the pattern was to add as many zeroes as we see in the problem. For example, 25 x 10 contains 1 zero, so the answer is 250. 25 x 100 has 2 zeroes, so the answer is 2 500. 25 x 1000 has 3 zeroes, so the answer is 25 000, etc.
We realised we could do the same thing with basic facts and place-value patterns:
7 x 8 = 56

7 x 80 = 560

7 x 800 = 5600

7 x 8000 = 56 000

Ta-da!  Astound your family with your INCREDIBLE multiplication skills!

See you tomorrow,

Ms. Lewis.