Mental Math with the Compensation Strategy, Grade 4
A practice worksheet for 4th graders that teaches mental addition through the compensation strategy: round one addend to a friendly number, add, then subtract the extra amount. It builds number sense and mental math fluency with worked examples, a number line, and practice problems like 119 + 126.
“create a worksheet for students to use mental math to add numbers such as 119+ 126 by rounding to add and then subtracting this number out”
Teacher Guide & Tips
- Introduce the key terms (friendly number and compensation) and work through Example 1 together before students try problems independently, using a 20-30 minute mini-lesson.
- Discussion question: Why does rounding 48 up to 50 make the problem easier, and how do we know to subtract 2 at the end?
- Scaffold for struggling readers: have them use the number line graphic to physically count the jump from the rounded number back to the original, and begin with problems where one addend is within 5 of a friendly number.
- Extension for advanced students: ask them to try compensation with numbers that need rounding down (such as 52 + 37 using 50) and to explain when rounding up or down is more efficient.
- Plan roughly 35-45 minutes for the full packet, which works well as independent practice or partner work after the lesson.
What is Diffit?
Teachers use Diffit to get quality materials for their unique classrooms. Adjust difficulty, add scaffolds, or change the topic to get started.
Try Diffit for free“create a worksheet for students to use mental math to add numbers such as 119+ 126 by rounding to add and then subtracting this number out”
Teacher Guide & Tips
- Introduce the key terms (friendly number and compensation) and work through Example 1 together before students try problems independently, using a 20-30 minute mini-lesson.
- Discussion question: Why does rounding 48 up to 50 make the problem easier, and how do we know to subtract 2 at the end?
- Scaffold for struggling readers: have them use the number line graphic to physically count the jump from the rounded number back to the original, and begin with problems where one addend is within 5 of a friendly number.
- Extension for advanced students: ask them to try compensation with numbers that need rounding down (such as 52 + 37 using 50) and to explain when rounding up or down is more efficient.
- Plan roughly 35-45 minutes for the full packet, which works well as independent practice or partner work after the lesson.
Mental Math with the Compensation Strategy, Grade 4
A practice worksheet for 4th graders that teaches mental addition through the compensation strategy: round one addend to a friendly number, add, then subtract the extra amount. It builds number sense and mental math fluency with worked examples, a number line, and practice problems like 119 + 126.
What is Diffit?
Teachers use Diffit to get quality materials for their unique classrooms. Adjust difficulty, add scaffolds, or change the topic to get started.
Try Diffit for free