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Math Lesson Plan Activity: Teach students a math concept Grade: 5 Concept: Russian Peasant Multiplication Materials Chalk and chalkboard Objectives Students will: 1. Learn the Russian Peasant Multiplication method. 2. Be able to perform this method on their own. 3. Identify why it is easier than regular multiplication Procedures 1. Tell students you are going to teach them a new, easier method of doing multiplication. Say it only requires them to know their two times tables and how to double and divide numbers by two. Ask if they think they can do that, and whether or not you can prove it. 2. Introduce the Russian Peasant Multiplication method. Tell the class to pick two numbers to multiply together. (But not too big, say with no more than two digits in each #, so the teacher can teach it easily). 3. Write the numbers on the board, side by side. Tell the class it’s usually best to put the smaller number first. Tell students they will always halve the first number and double the second number. 4. When halving the first number, tell students if the number being divided is odd, they will throw the remainder of one when they divide away. For example if they pick 35, the answer would be 17.5, they would just use 17, and continue on normally as though nothing had happened. They will continue halving until the number is one. 5. Then once all the numbers have been doubled or halved as instructed, ask which are odd numbers in the first column. Once they have identified these numbers tell them they will add the numbers in the second column that corresponds with the odd in the first column. Example: numbers 35 x 42 17 84 8 168 4 336 2 672 1 1344 ( numbers in blue are the numbers that correspond with the odd numbers in green from the 1st column . The blue numbers in 2nd column you add together) So: 42 + 84 + 1344 = 1470 and: 35 x 42 = 1470 6. Ask the class which is easier, multiplying out 35 and 42 or just using the Russian Peasant method. 7. Do more examples on the board, and ask if there are any questions. Ask students to come up and do the method themselves, and explain what they are doing as they are doing it. Closure Assign problems for homework or an in class assignment. For example: 1. 22 x 41 2. 17 x 32 3. 21 x 67 4. 40 x 80 5. 9 x 19 6. 14 x 99 7. 75 x 101 8. 130 x 132 9. 115 x 120 10. 15 x 200 Assessment 1. Students can perform multiplication by the usual method and by Russian Peasant multiplication. 2. Can recognize why this might be easier than regular multiplication 3. Using this method is a another example of multiplying by breaking down the steps to use smaller numbers, thus making it easier for students who aren’t as advanced as some of the other students. 4. Students will complete the assigned problems successfully and understand the concept.