Foundations Sampler 2024

27 A2 Lesson Plans 53 TheToasty Cereal box has 25 pieces. The Krispie Cereal box has 31 pieces. How many pieces in both boxes? Put together the blocks with the same place value. Record. Build. Add.Record. 1. 2. 3. 31 + 25 tens ones 3 1 2 5 + + + 4 3 4 5 + 2 5 6 2 + Build the numbers on the mat. Adding 2-Digit Numbers 53 ©MathTeachersPress, Inc.All rights reserved. tens ones tens ones tens ones tens ones tens ones tens ones 2 3 4 4 6 7 8 8 8 7 Objective: To count objects by tens and ones and add the numbers. Materials: Interlocking cubes, containers (small, empty cereal boxes), base ten blocks, Place Value Mats (or Master 12), sticky note pads, crayons Counting by Tens and Ones Give each pair of students or small group a small cereal box that has been filled with interlocking cubes taped shut and labeled with a capital letter beginning with A. Put from 20 to 24 cubes in each box. Today we are going to find how many cubes are inside each cereal box, and then add the cubes from one box to the cubes in another box. First, I want you to shake your box and then guess how many cubes are inside. Write your guess on a sheet of paper. Now, carefully empty out the cubes and count how many are inside. Have a volunteer demonstrate how to count by ones to find the number of cubes in a box. After counting, write on the board: Cereal box A = ones cubes Discuss whether there is a quicker or more efficient way to count the number of cubes. What is the special number we always group by in our number system? (10) Ask a volunteer to join together sticks of 10 cubes. How many sticks of 10? How many leftover ones? Example: Cereal box A = 24 ones cubes = 2 sticks of 10 and 4 ones = 2 tens and 4 ones or 24 Now have each student or pair of students complete the same activity with their cereal boxes. When the counting is completed, write the numbers counted in each box. Discuss why the answers are not the same. (Some boxes were packed more tightly than others.) Write the number of cubes in each box on a sticky note and attach to the box. Addition on a Place Value Mat Select two cereal boxes. Ask how many cubes are in each box and write the amount on the chalkboard. Example: Box A has 24 cubes Box B has 22 cubes How can we find the number of cubes in boxes A and B together? Have the students discuss various solutions. (I would pour them altogether and then count them one by one. I would pour them altogether and then make stacks of tens and left over ones). After discussing some possibilities, write on the board: Box A = 24 cubes 2 tens 4 ones Box B = 22 cubes 2 tens 2 ones _______________________________ 4 tens 6 ones Select two more cereal boxes and ask the class to find the total number of cubes in both boxes. What is the pattern? (Add the ones together. Add the tens together.) Direct attention to the picture and problem at the top of the page. Ask a volunteer to read the problem aloud. Have students build 31 and 25 with base ten blocks. Work through the steps of the problem together. Have students complete the rest of the page on their own. Remediation Some students may reverse their numbers and read 24 for 42. Using two different color crayons, always write the digit in the tens place (the number written first) with the same color to help students visually distinguish between the numbers. The place value mat showing tens and ones might also have the tens place and ones place colored correspondingly. S KILL B UILDERS 11-6, 32-3, 32-4 Counting by Tens and Ones Introducing place value when counting by tens and ones A2 Lesson Plan ELL Strategies Write on the board: 10 ones is the same as 1 ten. Underneath that sentence, write: 10 groups of one is the sam as 1 group of ten. Explain that when one or en is written as a word, the word is a noun that refers to a group. Since these are nouns, we can use the plural: ones and tens. When the numeral 1 or 10 is used, the numeral is an adjective that tells how many groups. To avoid further confusion, try not to write 1s or 10s when writing problems on the board.