1 / 7

Little Bites at Big Multiplications

Little Bites at Big Multiplications. I am learning to solve multiplication and division problems using factors of factors. e.g. 8 X 9 = ?. (2 X 2 X 2) X 9 = ?. Let’s see how factors can be used to work out 6 X 5 = ?. Both 3 and 2 are factors of 6 ( 2 X 3 = 6).

bradleymay
Download Presentation

Little Bites at Big Multiplications

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Little Bites at Big Multiplications I am learning to solve multiplication and division problems using factors of factors. e.g. 8 X 9 = ? (2 X 2 X 2) X 9 = ?

  2. Let’s see how factors can be used to work out 6 X 5 = ? Both 3 and 2 are factors of 6 (2 X 3 = 6). Below is a fly strip with 5 faces. Let’s multiply this amount by 2 (2 X 5 = 10). Now let’s multiply this amount by 3 (3 X 10) = 30. 2 X 5 = 10 3 X 10 = 30 So 2 X 3 X 5 = 30 is the same as 6 X 5 = 30

  3. Now let’s use factors to work out 8 X 5 = ? 2 is a factor of 8 (2 X 2 X 2 = 8). Below is a fly strip with 5 faces. Let’s multiply this amount by 2 (2 X 5 = 10). Now let’s multiply this amount by 2 (2 X 10) = 20. So 2 X 2 X 2 X 5 = 40 is the same as 8 X 5 = 40 Now multiply this amount by 2 (2 X 20) = 40. 2 X 5 = 10 2 X 10 = 20 2 X 20 = 40

  4. Now let’s use this method to work out a more difficult question. 12 X 52 = ? 3 X 2 X 2 = 12 so I could use these as factors. 3 X 52 = 156 2 X 156 = 312 So 12 X 52 = 624 2 X 312 = 624

  5. We can also use factors to help us work out division questions. 64 ÷ 8 = ? First we must find the factors of 8. 2 X 2 X 2 = 8 64 ÷ 2 = 32 32 ÷ 2 = 16 16 ÷ 2 = 8 So 64 ÷ 8 = 8

  6. Now lets use this strategy for a more difficult division question. 180 ÷ 12 = ? First we must find the factors of 12. 2 X 3 X 2 = 12 180 ÷ 2 = 90 90 ÷ 3 = 30 30 ÷ 2 = 15 So 180 ÷ 12 = 5

  7. Use this strategy to work out answers to the questions below Click again when you have worked out all your answers. 1) 8 X 23 = ? 2) 12 X 14 = ? 3) 216 ÷ 12 = ? 4) 128 ÷ 8 = ? 5) 9 X 31 = ? 184: 2 X 23 = 46, 46 X 2 = 92, 92 X 2 = 184 168: 2 X 14 = 28, 28 X 2 = 56, 56 X 3 = 168 18: 216 ÷ 2 = 108, 108 ÷ 2 = 54, 54 ÷ 3 = 18 16: 128 ÷ 2 = 64, 64 ÷ 2 = 32, 32 ÷ 2 = 16 279: 3 X 31 = 93, 93 X 3 = 279 Need some more practise? Try Pg51 & 52 of Teacher Tools Multiplication and Division Book Numeracy resources

More Related