![]() However, your students must understand WHY it works. You can begin modeling doubling and halving with basic facts like 5×6. For example, doubling and halving would be an efficient strategy for:ĭoubling and halving is a fantastic strategy for your students to work with. USING DOUBLING AND HALVINGĭoubling and halving works best when one of the factors is even, and when the other factor is a number like 5, 10, 25, or 50. However, this does not make the problem easier to solve, and there are other strategies that would be more effective in solving 17×15. Technically we could half the 17 to make 8.5 and double the 15 to make 30. Halving and doubling will always work, but there are some situations that are better suited to it than others. Try this yourself with 3×8! DOES IT ALWAYS WORK? All we did was half the number of rows and double the number of objects in each row. Suppose we divide the number of rows in half and we rearrange them like this:ĭo we still have the same number of objects? Yes! They are just arranged differently. Let’s take a look at exactly why the halving and doubling strategy works. ![]() It’s essential to know WHY strategies work. We could actually take this one step further if we wanted to, by doubling the 50 to make 100 and halving the 8 to make 4. ![]() Suddenly this problem becomes much easier to solve! To solve 25×16, we could double the 25 to make 50 and then half the 16 to make 8. To use halving and doubling, you simply half one of the factors and double the other. The best part is that it actually IS a strategy – not a trick.įirst, let’s take a look at the halving and doubling strategy in action. The halving and doubling strategy for multiplication is one of the most fascinating multiplication strategies.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |