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O'Brien Multiplication Answer Key

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Math Facts
#1 4 x 6 24
#2 5 x 7 35
#3 2 x 9 19
#4 7 x 8 56
#5 20 x 80 1600
Story Problems
#1 If Katie had four baskets and each basket had nine apples, how many apples all together? 36
#2 Michael wanted to borrow video games from his friends. He wanted 27 games all together. If each friend gave him 3 games each, how many friends did he have to borrow from? 9
#3 A teacher was counting her class by 5's, when she finished counting she ended on 140, how many students did she have in her class? 28
#4 If there are 3 friends and they each have 12 peaches, how many peaches do they have all together? 36
#5 If it rained 7 inches every day for 7 days, how many inches did it rain all together? 49
Arrays
#1 Draw an array that shows 4 x 6 show me your board
#2 If I had an array that was 8 x 3, what would the product be? 24
#3 If I had an array that had a product of 20, what could the dimensions be? 10 x20, 1 x20 or 4x 5
#4 What is an array a picture showing a multiplication problem
#5 How could I break down a 6 x 7 array into smaller arrays? show me your thinking
Multiples
#1 What are the multiples of 3 3, 6, 9, 12, 15, 18, 21
#2 What are the multiples of 7 7, 14, 21, 28, 35, 42, 49
#3 What are the multiples of 10 10, 20, 30, 40, 50, 60, 70
#4 What are the multiples of 8 8, 16, 24, 32, 40, 48, 56
#5 What are the multiples of 12 12, 24, 36, 48, 60, 72, 84
Misc
#1 If one of your factors is zero, what will your product be? zero
#2 If you multiply by 5, what two numbers will the product always end in? Either 5 or 0
#3 If you multiply an even number by an even number what will your product always be? An even number
#4 What is the repeated addition that would show 2 x 7 2+2+2+2+2+2+2 or 7+7
#5 There are six bookshelves, each bookshelf has eight books. How would you write the repeated addition AND the multiplication equation for this problem 8+8+8+8+8+8 or 6 x 8
Final Question