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Today’s Adventure: Multiplication with Missing Numbers! – Multiplication as groups of items – Think of multiplication like adding the same number over and over. – Daily life applications – Multiplication helps in quickly finding totals, like in setting tables for a party. – Finding missing numbers – Use multiplication to find a total when you know the number of groups and the group size. – Practice with examples – We’ll solve problems together to find the missing number in a multiplication sentence. | This slide introduces the concept of multiplication as a means of combining equal groups to find a total, which is a foundational skill in third-grade mathematics. Emphasize the practicality of multiplication in everyday scenarios, such as calculating total items needed for an event. The focus is on understanding and identifying the missing factor in a multiplication equation, which is a common type of word problem at this grade level. Provide clear examples and encourage students to visualize the problem. During the lesson, guide students through several practice problems, asking them to find the missing number that completes the multiplication sentence. This will prepare them for the activity where they will apply this skill independently or in small groups.

Understanding Multiplication – Multiplication: Repeated addition – It’s like adding the same number over and over! – Example: 3 x 2 equals adding 2 three times – Instead of 2 + 2 + 2, we can write 3 x 2 – Multiplication as a shortcut – Faster than addition for the same number – Practice with missing numbers – Find the missing number: 4 x ? = 20 | This slide introduces the concept of multiplication as a form of repeated addition, which is a foundational understanding for third graders. Start by explaining that multiplication is simply adding the same number multiple times. Use the example provided to illustrate this point. Emphasize that multiplication is a quicker way to add the same number several times. To apply this concept, present a problem where students must find the missing number in a multiplication equation, reinforcing their understanding of multiplication as a method of repeated addition and introducing them to solving for unknowns.

Multiplication Mysteries: Finding the Missing Number – Word problems: a numerical story – Clues help solve the mystery – Look for keywords like ‘total’, ‘each’, ‘groups of’ – What’s the question in the story? – Is it asking for a total, a group, or something else? – Practice with an example problem – 3 groups of ___ equals 9. What’s the missing number? | This slide introduces students to the concept of solving multiplication word problems by finding the missing number. Emphasize that word problems are like stories that involve numbers, and our job is to uncover the mystery of the missing number. Teach students to look for clues or keywords in the text that indicate multiplication, such as ‘total’, ‘each’, or ‘groups of’. Help them identify the question being asked in the problem, which guides what they are solving for. Finally, provide a simple example and walk through the steps to find the missing number. Encourage students to practice with similar problems and to always check their work by reversing the operation.

Multiplication Mysteries: Finding the Missing Number – Understanding the multiplication mystery – Use multiplication facts as clues – Think of it like a puzzle where you know some pieces and need to find the others – Example: 4 x ? = 20 – What number times 4 equals 20? Use your multiplication table to help! – Solving for the missing number – We can divide 20 by 4 to find the missing number, which is 5 | This slide introduces students to the concept of finding a missing number in a multiplication equation, framing it as a fun mystery to solve. Encourage students to use their knowledge of multiplication facts to uncover the missing piece. For example, in the equation 4 x ? = 20, guide them to understand that they need to find a number that, when multiplied by 4, results in 20. This can be done by recalling multiplication tables or by using division as the inverse operation of multiplication. The goal is to help students become comfortable with these types of problems and to see them as an enjoyable challenge. During the class, provide additional examples and allow students to work in groups to solve similar problems, fostering a collaborative learning environment.

Let’s Practice Multiplication! – Calculate stickers in packs – 5 stickers/pack × 6 packs = ? – Count chairs in rows – 7 rows × 8 chairs/row = ? | This slide is an interactive class activity designed to help students practice multiplication word problems. For Example 1, guide the students to visualize 6 packs of stickers with 5 stickers in each, and then multiply 5 by 6 to find the total number of stickers. For Example 2, help them picture 7 rows of chairs, with 8 chairs in each row, and multiply 7 by 8 to find the total number of chairs. Encourage students to draw arrays or use physical objects to represent the problems if needed. This will help them understand the concept of multiplication as repeated addition. After solving, discuss the answers as a class to ensure understanding.

Solving Multiplication Problems with Missing Numbers – Understand the missing factor – Example: ? x 3 = 9 – What number multiplied by 3 equals 9? – Use division for the missing number – Divide 9 by 3 to find the missing number – Practice together: 8 x ? = 32 – Let’s solve 8 x ? = 32 as a class | This slide is aimed at helping third-grade students understand how to find a missing number in a multiplication equation. Start by explaining that a missing factor in multiplication is like a mystery number we need to discover. Use the example ‘? x 3 = 9’ to illustrate how to think about the problem. Explain that division is the key to finding the missing number because it is the inverse operation of multiplication. For the practice problem ‘8 x ? = 32’, guide the students through the process of dividing 32 by 8 to find the missing number. Encourage students to work together and discuss their thought process. The goal is for students to become comfortable with using division to solve for missing factors in multiplication problems.

Class Activity: Multiplication Mystery – Solve mysteries with a partner – Receive a worksheet of problems – Find the missing numbers – Use multiplication skills to uncover the missing factors – Complete the story puzzle – Each answer helps unravel the story’s mystery | This activity is designed to encourage collaborative problem-solving and application of multiplication skills. Each pair of students will receive a worksheet containing a series of word problems that form a story. As they solve the problems by finding the missing numbers, they will fill in the blanks in the story, revealing the narrative piece by piece. This approach helps to contextualize multiplication in a fun and engaging way. For the teacher: Prepare diverse worksheets with different stories to cater to various interests. Ensure the problems include factors up to 10 and provide clear instructions on how to approach solving for the missing number. Circulate the room to assist pairs as needed and encourage discussion between partners. After the activity, have a few pairs share their completed stories and the multiplication problems they solved.

Multiplication Mysteries: Homework Challenge – Congratulations on your detective work! – Practice with your worksheet at home – Find the missing numbers in each problem – Use multiplication facts up to 10 to solve – Share your solutions next class – Discuss how you solved the problems | This slide wraps up the lesson on multiplication word problems and transitions students to independent practice at home. The worksheet provided should contain a variety of multiplication problems with missing factors, allowing students to apply what they’ve learned in class. Encourage them to use strategies discussed during the lesson, such as drawing arrays or using repeated addition. Remind students that practicing these problems will help solidify their understanding of multiplication. In the next class, allocate time for students to share their answers and explain their problem-solving methods, fostering a collaborative learning environment.