Basic Addition and Subtraction Problems

In this lesson, students learn to add and subtract using groups of tens. The teacher begins with a simple addition of apples and transitions to using groups of tens, illustrating the concept with fireflies and fish tanks. Students practice both addition and subtraction, using visual aids and number sentences. The lesson concludes with independent practice and a focus on understanding the 'say 10' method and regular counting.

If you start with 2 apples and add 1 more, how many apples do you have in total?

• 3 apples

• 2 apples

• 4 apples

• 1 apple

What is the number sentence for adding 2 groups of tens and 1 more group of ten?

• 2 + 1 = 3

• 20 + 10 = 30

• 2T + 1T = 3T

• 21 + 1T = 3T

How do you express 20 + 10 using individual counting sticks?

• 20 + 10 = 30

• 2T + 1T = 3T

• 10 + 10 = 20

• 30 + 10 = 40

What is today's learning goal?

• Add and subtract groups of 5

• Divide groups of 10

• Add and subtract groups of 10

• Multiply groups of 10

If you start with 3 jars of fireflies and add 1 more jar, how many jars do you have?

• 5 jars

• 4 jars

• 3 jars

• 2 jars

How do you express 30 + 10 in the regular way?

• 30 + 10 = 40

• 3T + 1T = 4T

• 20 + 10 = 30

• 10 + 10 = 20

How many fish tanks are left if you start with 4 and subtract 1?

• 1 tank

• 2 tanks

• 3 tanks

• 4 tanks

What is the result of 30 minus 10?

• 10

• 20

• 30

• 40

What should you do after watching the lesson?

• Ask a friend

• Watch another video

• Practice independently

• Forget about it