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Understanding Note to the teacher • Using this slideshow with manipulatives (counters or tiles) will help reinforce the concepts of multiplication and division. • Each student should have about 65 counters or tiles to model the problems in this slideshow. • Guide students through the problems, circulating the room to see that each student is displaying manipulatives that correspond to the problems. Use multiplication when you have to add the same number over and over again. array Addition Addition Addition + Addition Can you model these multiplication problems using the manipulatives on your desk? Samantha is saving $6 each week for a bike. How much money will she have in 9 weeks? Samantha is saving $6 each week for a bike. How much money will she have in 9 weeks? There are three tennis balls in each can. How many tennis balls are there in 8 cans? There are three tennis balls in each can. How many tennis balls are there in 8 cans? Amy needs five strawberries for each smoothie. She is making five smoothies. How many strawberries will she need? Amy needs five strawberries for each smoothie. She is making five smoothies. How many strawberries will she need? Each smoothie needs two bananas. How many bananas are needed to make eight smoothies? Each smoothie needs two bananas. How many bananas are needed to make eight smoothies? Ramona needs seven beads for each necklace she is making. How many beads will she need to make eight necklaces? Ramona needs seven beads for each necklace she is making. How many beads will she need to make eight necklaces? Kim burns 5 pieces of firewood each night in her fireplace. How many pieces of wood will she use in a week? Kim burns 5 pieces of firewood each night in her fireplace. How many pieces of wood will she use in a week? Four girls slept in each tent. How many girls were in six tents? Four girls slept in each tent. How many girls were in six tents? Each flashlight holds three batteries. How many batteries are needed for 9 flashlights? Each flashlight holds three batteries. How many batteries are needed for 9 flashlights? There are ten fancy light fixtures hanging in our family’s restaurant. Each one uses six light bulbs. How many bulbs are needed for all the fixtures? There are ten fancy light fixtures hanging in our family’s restaurant. Each one uses six light bulbs. How many bulbs are needed for all the fixtures? If one sandwich is made with four meatballs, how many do you need to make seven meatball sandwiches? If one sandwich is made with four meatballs, how many do you need to make seven meatball sandwiches? How many eggs are in 5 dozen? How many eggs are in 5 dozen? • Every porch on our street is decorated with three pots of mums. How many pots of flowers are on all seven porches? Every porch on our street is decorated with three pots of mums. How many pots of flowers are on all seven porches?