Exploring 2-Digit Addition with Open Number Lines

Exploring 2-Digit Addition with Open Number Lines

Assessment

Interactive Video

Mathematics

6th - 10th Grade

Hard

CCSS
1.NBT.C.4, 2.NBT.B.7, 2.NBT.B.6

+2

Standards-aligned

Created by

Mia Campbell

FREE Resource

Standards-aligned

CCSS.1.NBT.C.4
,
CCSS.2.NBT.B.7
,
CCSS.2.NBT.B.6
CCSS.2.NBT.B.5
,
CCSS.2.MD.B.6
,
Mrs. T from PS11 demonstrates how to solve a two-digit addition problem using an open number line. She explains the concept of an open number line and provides a step-by-step guide to solving 45 + 32 by adding tens and ones separately. An alternative method using a large jump to add tens is also shown. The tutorial emphasizes visual representation and place value strategies.

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9 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is an open number line?

A number line that can only be used digitally.

A number line with no numbers or markers, added as we work.

A number line with predefined numbers and markers.

A graphical tool only for subtraction.

Tags

CCSS.2.NBT.B.7

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the starting number in the example provided?

32

45

10

77

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many tens are added first in the example?

Two tens

Three tens

Four tens

Five tens

Tags

CCSS.2.NBT.B.6

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does each jump represent when adding tens?

10

15

20

5

Tags

CCSS.2.MD.B.6

CCSS.1.NBT.C.4

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many ones are added after the tens?

One

Four

Two

Three

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the final sum of 45 plus 32?

75

80

77

82

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What alternative method is shown for adding tens?

Using multiplication

Adding each ten separately

Subtracting then adding back

Adding all tens in one jump

Tags

CCSS.2.MD.B.6

CCSS.1.NBT.C.4

8.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the sum after adding 30 all at once to 45?

65

85

75

95

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

9.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why might students choose to add all tens at once?

It's a slower process.

It's only for advanced students.

It requires less space on the number line.

It's more challenging.

Tags

CCSS.2.MD.B.6

CCSS.1.NBT.C.4