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Students review multiplication facts and solve problems by using arrays, such as the examples below. They also solve problems about factors of a number and number relationships, such as this one: If 25 is a factor of 100, will 25 also be a factor of 300? How do you know? Students are introduced to multiplicative comparison problems. Students will work on multiplication and division in two other Grade 4 units later this year. In these units, they solve problems with larger numbers and share a variety of solution strategies.
Activities to Try at Home
Array Search Look for items around your house or at the grocery store that are packaged or arranged in rectangular arrays: tiles on the floor, eggs in a carton, window panes, a six-pack of juice cans, and so on. Talk with your child about the dimensions (number of rows and columns), and discuss ways to figure out the total number of items.
Arranging Chairs Suppose you have 40 chairs. You want to arrange them into straight rows for an audience to watch a play. You need to arrange the chairs so that there will be the same number in every row. How many different ways could you do this? (What if you start with 50 chairs? 75? 72? 71?)
Modeling Multiplication Situations Encourage your child to help you solve multiplication situations that come up in your daily activities. While you shop, you might ask: How many juice boxes will we have if they come in packages of 3 and we buy 6 packages? At the park, you might ask: If there are 8 soccer teams in our town and each team has 11 players, how many kids play soccer?
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