Section 1
Adding Like Units Mentally
Property
To add numbers mentally, you can combine quantities that have the same place value unit. This follows the principle: .
In this Grade 4 Eureka Math lesson from Chapter 4, students use place value understanding to fluently add multi-digit whole numbers using the standard addition algorithm. The lesson builds on rounding and base ten unit skills through fluency practice before guiding students to apply the algorithm to solve word problems with tape diagrams. A real-world calorie-tracking problem helps students connect estimation strategies, including rounding to the nearest thousand and ten thousand, to multi-digit addition.
Section 1
Adding Like Units Mentally
To add numbers mentally, you can combine quantities that have the same place value unit. This follows the principle: .
Section 2
Solving Addition Word Problems Using Tape Diagrams
A tape diagram models an addition problem by representing the addends as parts of a whole. The total, or sum, is the unknown whole. This relationship can be shown with the equation: .
Section 3
Adding Multi-Digit Numbers with Renaming
When adding digits in a place value column, if the sum is 10 or more, we regroup the sum into the next higher place value. For example, 14 ones is regrouped as 1 ten and 4 ones. This process is called renaming or carrying.
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Section 1
Adding Like Units Mentally
To add numbers mentally, you can combine quantities that have the same place value unit. This follows the principle: .
Section 2
Solving Addition Word Problems Using Tape Diagrams
A tape diagram models an addition problem by representing the addends as parts of a whole. The total, or sum, is the unknown whole. This relationship can be shown with the equation: .
Section 3
Adding Multi-Digit Numbers with Renaming
When adding digits in a place value column, if the sum is 10 or more, we regroup the sum into the next higher place value. For example, 14 ones is regrouped as 1 ten and 4 ones. This process is called renaming or carrying.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter