Domino Dots: Solving Math Riddles with Dice!

Math Grades 1st Grade 3:22 Video
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Lesson Description

Let's learn how to solve tricky word problems using dominoes and dice! We'll use addition and subtraction to find hidden numbers.

Video Resource

Spots on a die | Addition and subtraction within 100 | Early Math | Khan Academy

Khan Academy

Duration: 3:22
Watch on YouTube

Key Concepts

  • Addition and subtraction within 100
  • Solving word problems
  • Understanding 'more than' in word problems
  • Using place value to subtract

Learning Objectives

  • Students will be able to solve addition and subtraction word problems within 100.
  • Students will be able to identify the unknown number in a word problem.
  • Students will be able to use place value to subtract two-digit numbers.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they've ever played with dominoes or dice. Discuss how the dots on them represent numbers. Explain that today they'll be detectives, solving math mysteries using dominoes and dice!
  • Video Viewing (7 mins)
    Play the Khan Academy video "Spots on a die | Addition and subtraction within 100 | Early Math | Khan Academy". Encourage students to pay close attention to how the narrator solves the problem.
  • Discussion (5 mins)
    After the video, facilitate a class discussion about the problem. Ask students to explain in their own words what the video was about. Focus on understanding 'more than' and how it relates to subtraction in this specific context.
  • Guided Practice (10 mins)
    Work through a similar word problem with the students. For example: 'There are 55 candies in a jar. This is 23 more candies than in a bag. How many candies are in the bag?' Guide them to write the equation: ? + 23 = 55, and then solve for the unknown using subtraction.
  • Independent Practice (10 mins)
    Provide students with additional word problems to solve independently. Encourage them to draw pictures or use manipulatives (like base-ten blocks) to help them visualize the problem.

Interactive Exercises

  • Domino Math
    Give each student a set of dominoes. Have them choose two dominoes and find the total number of dots. Then, ask them to create a word problem using those numbers.
  • Dice Roll Challenge
    Have students roll two dice. They must then come up with a word problem where they need to subtract one number from another.

Discussion Questions

  • What was the problem the video was trying to solve?
  • Why did we need to subtract even though the problem used the words 'more than'?
  • How can drawing a picture help you solve a word problem?
  • Can you think of a time you had to solve a math problem like this in real life?

Skills Developed

  • Problem-solving
  • Critical thinking
  • Addition and subtraction fluency
  • Place value understanding
  • Word problem comprehension

Multiple Choice Questions

Question 1:

Lily has 32 stickers. This is 12 more stickers than Tom has. How many stickers does Tom have?

Correct Answer: 20

Question 2:

Which number is missing? ? + 10 = 25

Correct Answer: 15

Question 3:

Ben has 45 toy cars. He gives 20 to his friend. How many cars does Ben have left?

Correct Answer: 25

Question 4:

What does 'more than' sometimes mean you need to do?

Correct Answer: Subtract

Question 5:

Which of these problems can you use to find the missing number in ? + 5 = 12?

Correct Answer: 12 - 5

Question 6:

Sara has 63 beads. Mia has 41 beads. How many more beads does Sara have than Mia?

Correct Answer: 22

Question 7:

Tim has 24 cookies. He eats 4. How many cookies are left?

Correct Answer: 20

Question 8:

Which equation can help you solve the problem: There are 35 birds on a tree. 15 fly away. How many are left?

Correct Answer: 35 - 15 = ?

Question 9:

Which number is bigger: 52 or 25?

Correct Answer: 52

Question 10:

What is 40 - 10?

Correct Answer: 30

Fill in the Blank Questions

Question 1:

When we take away some things, it is called ____________.

Correct Answer: subtraction

Question 2:

When we put things together, it is called ____________.

Correct Answer: addition

Question 3:

34 + 10 = ____________

Correct Answer: 44

Question 4:

50 - 20 = ____________

Correct Answer: 30

Question 5:

The answer to an addition problem is called the ____________.

Correct Answer: sum

Question 6:

The answer to a subtraction problem is called the ____________.

Correct Answer: difference

Question 7:

If 10 + ? = 20, then ? = ____________.

Correct Answer: 10

Question 8:

A six-sided die has ________ sides.

Correct Answer: six

Question 9:

To solve a word problem, you need to _________ carefully.

Correct Answer: read

Question 10:

88 - 8 = _________

Correct Answer: 80

Educational Standards

CCSS.Math.Content.1.OA.A.1:Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. CCSS.Math.Content.1.NBT.C.4:Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten. CCSS.Math.Content.1.OA.D.8:Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.

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