Before you practice the work from this chapter, take some time to go over some of the multiplication and division strategies and problems we've looked at. These include:
using arrays to solve multiplication and division problems
partitioning, or splitting numbers to solve multiplication problems
using an area model to solve division problems
using a vertical algorithm to solve multiplication and division problems
With these strategies, we were able to move on to multiplication of larger numbers by two digit numbers . We were also able to solve division problems with remainder , as well as dividing by two digit numbers.
Let's use an area model to find 77 \times 3.
Fill in the areas of each rectangle.
What is the total area of all four rectangles?
Find 77 \times 3.
Find the product of 235 \times 14.
Find the value of 2518\div 8.
We have different ways we can solve multiplication and division problems, and as our numbers get larger, the algorithm method can be more useful. Being able to regroup (trade), as well as find remainders with division is important.
selects and applies appropriate strategies for multiplication and division, and applies the order of operations to calculations involving more than one operation