Objectives for this lesson:
1.
Given written word problems and numerical questions with sums and minuends less than 10 000, students will correctly solve addition and subtraction problems with at least 80% accuracy.
2.
During individual and group problem-solving activities, students will show confidence and persistence when solving addition and subtraction problems with sums and minuends less than 10 000 by attempting all assigned problems and participating actively in discussions.
3.
Using place-value charts or written algorithms, students will demonstrate the correct procedures for adding and subtracting numbers with sums and minuends less than 10 000 by completing all steps correctly in 4 out of 5 problems.
Important terms to remember
Addition Synonyms & Meanings
Add
Meaning:
To put numbers together to find how many in total.
👉 Example: Add 3 and 5 to get 8.
Plus
Meaning:
The math word that means add.
👉 Example: 4 plus 6 equals 10.
Total
Meaning:
The final amount after adding everything together.
👉 Example: The total of 2 and 3 is 5.
Sum
Meaning:
The answer you get when you add numbers.
👉 Example: The sum of 7 and 8 is 15.
Altogether
Meaning:
How many there are in all.
👉 Example: How many apples do we have altogether?
Increase
Meaning:
To make a number bigger by adding more.
👉 Example:
If you have 5 stickers and get 3 more, the number of stickers increases to 8.
🧠 Think: “The number goes up.”
Combine
Meaning:
To join groups together.
👉 Example:
Combine 4 red marbles and 6 blue marbles to find how many there are in all.
🧠 Think: “Put groups together.”
Subtraction Synonyms & Meanings
Subtract
Meaning:
To take away one number from another.
👉 Example: Subtract 3 from 10 to get 7.
Minus
Meaning:
The math word that means take away.
👉 Example: 9 minus 4 equals 5.
Take Away
Meaning:
To remove something from a group.
👉 Example: Take away 2 cookies from 6.
Difference
Meaning:
The answer you get when you subtract.
👉 Example: The difference between 10 and 6 is 4.
Left
Meaning:
What remains after something is taken away.
👉 Example: If you eat 3 out of 8 sweets, how many are left?
Decrease
Meaning:
To make a number smaller by taking some away.
👉 Example:
If you have 10 balloons and 3 pop, the number of balloons decreases to 7.
🧠 Think: “The number goes down.”
Less
Meaning:
To have fewer than before.
👉 Example:
5 is less than 8 because it is smaller.
Watch this Video!
Group Activity
How to work together:
-
Work in groups of three.
-
Talk about each problem before writing the answer.
-
One person types, another checks, and another explains the steps.
-
Show working for every question.
