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Multiplying Decimals Lesson 11 5.NBT.1 5.NBT.7 Table of contents 5. 6. 7. 8. 9. 10. 11. 12. 13. Leave blank Application problem/Notes Notes Problem set Problem set Homework Show my work Homework Show my work Application Problem I. After school, Marcus ran 3.2km and Cindy ran 1.95km. Who ran farther? How much farther? 3 x 0.2 = 0.6 ones tenths 0.2 x3 0.6 is 3 sets of 2 tenths 4 x 0.423= ones 1 Place value chart (uses dots) tenths 6 1.692 hundredths 9 thousandths 2 Area Model 4 x 0.423= 0.423 on the top boxes 6 x 1.21= 1 one 6 6 ones 6 2 tenths 1 hundredth 12 tenths 6 hundredths +1.2 +.06 6.000 1.21 1.200 x +0.006 7.206 6 7.26 Multiplying decimals using the lattice or algorithmic form When multiplying decimals, pretend it is one big whole number 1. Put the biggest number on top 2. Put the smaller number on the bottom 3. Multiply 4. Count how many numbers are after the decimal 5. Starting at the right, count over as many numbers as you counted behind the decimal 6. Put your decimal there Lattice 1 2 1 1 6 7 2 2 6 6 6 Algorithmic 1 1.21 x 6 7.26 Problem Set (10 minutes) Do your personal best to complete the Problem Set within 10 minutes. Some problems do not specify a method for solving. Solve them the way that works for you. Review your answers with another student Exit ticket/Homework Complete your exit ticket and give it to the teacher