## Ms. Raejean

### Target 1​

###### Lesson Type:

Review

Number Operation

:

Computation

Subtract within 50.

###### 1:

Recognize the arithmetic symbols in a subtraction equation: minus (-) and equals (=).

###### 2:

Understand that subtraction means to take a quantity away from another quantity.

###### 3:

Understand that subtracting numbers means making a smaller number.

2nd

###### Vocabulary:

Subtraction, Minus, Count Back, Count Up

Activities:

Students reviewed subtraction strategies. Students used a hundreds chart and number line to help with counting back and couting up. We talked about when to use counting up or counting back.

Ex. 15 - 7. Start at 7, count up to 15. The number of jumps is the answer.

Ex. 29 - 7. Start with 29, count back 7. The answer is the number you land on.

## Absent Students:

### Target 2

:

###### 1:

Measure and compare length in nonstandard units.

###### 2:

Determine how to figure out the length of different objects when you cannot compare them directly (using a non-standard unit).

###### 3:

Understand that a non-standard unit must be placed end-to-end (with no gaps or overlap).

###### 4:

Order objects by length.

2nd

###### Vocabulary:

Measure, Lengths, Compare, (Line Segment - a line with 2 endpoints where it starts & stops)

Activities:

Students continued to practice measuring the length of objects with nonstandard units. First, students measured objects in the room with paper clips (chair, book, dry-erase marker). We reviewed how the paper clips have to be placed end-to-end with no gaps or overlaps. Then students had to determine if they would use more or less crayons to measure the same objects. Students agreed that less crayons would be used because they are larger than the paper clips. Next, students used ribbon to compare the length of line segments. Finally, students measured and compared the lengths of leaf images. We discussed how the leaves should be measured - in the middle from top to bottom, stem included. Students measured the leaves and cut the ribbon to show each length. Then students compared the leaves (using the ribbons) to mark the longest, shortest, and 2 that are the same size. Students who finished early used a ruler to measure each leaf to the nearest centimeter.

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Activities: