Unit 8 - Lesson 8 - Grade 2: Illustrative Mathematics

Last updated 11 months ago

21 questions

Note from the author:

Grade 2 Unit 8
Lesson 8: Count Columns and Objects in Columns
CC BY 2021 Illustrative Mathematics

Instructions

Grade 2 Unit 8
Lesson 8: Count Columns and Objects in Columns
CC BY 2021 Illustrative Mathematics

Lesson: Count Columns and Objects in Columns

Cool Down: Make Rows and Columns

Unit 8 - Lesson 8 - Grade 2: Illustrative Mathematics

Last updated 11 months ago

21 questions

Note from the author:

Grade 2 Unit 8
Lesson 8: Count Columns and Objects in Columns
CC BY 2021 Illustrative Mathematics

Instructions

Grade 2 Unit 8
Lesson 8: Count Columns and Objects in Columns
CC BY 2021 Illustrative Mathematics

Lesson: Count Columns and Objects in Columns

Estimation Exploration: Rearrange the Dots (Warm Up)

How many counters do you see?

Record an estimate that is:

Count by Columns

How many columns are in this array?

How many counters are in each column?

How many counters are there in all?

How many columns are in this array?

How many counters are in each column?

How many counters are there in all?

Use 10 counters to make 2 columns with the same number in each column.

How many counters are in each column?

How many rows are in the array?

How could you count these counters without counting by ones?

Use 15 counters to make 3 columns with the same number in each column.

How many counters are in each column?

How many rows are in the array?

How many counters are in each row?

How could you count these counters without counting by ones?

Guess My Array

Four students talked about their arrays.

Han said, “My array has an even number of counters. It has 2 rows with 6 counters in each row.”
Priya said, “My array has more than 10 counters. It has 4 rows with 3 counters in each row.”
Elena said, “My array is very tall. It has 6 counters in each column.”
Kiran said, “My array has more columns than rows. It has 3 rows.”

Which array belongs to which student? Write the name of each student below their array.

Each student used _______ counters to make an array.

Cool Down: Make Rows and Columns

Unit 8 - Lesson 8 - Grade 2: Illustrative Mathematics

Unit 8 - Lesson 8 - Grade 2: Illustrative Mathematics

Estimation Exploration: Rearrange the Dots (Warm Up)

How many counters do you see?

Record an estimate that is:

Count by Columns

How many columns are in this array?

How many counters are in each column?

How many counters are there in all?

How many columns are in this array?

How many counters are in each column?

How many counters are there in all?

How many counters are in each column?

How many rows are in the array?

How could you count these counters without counting by ones?

How many counters are in each column?

How many rows are in the array?

How many counters are in each row?

How could you count these counters without counting by ones?

Guess My Array

Which array belongs to which student? Write the name of each student below their array.

Show an array with 4 rows and 2 objects in each row.

How many columns are there? How many objects are in each column?

How many objects are there in all?

Estimation Exploration: Rearrange the Dots (Warm Up)

How many counters do you see?

Record an estimate that is:

Count by Columns

How many columns are in this array?

How many counters are in each column?

How many counters are there in all?

How many columns are in this array?

How many counters are in each column?

How many counters are there in all?

How many counters are in each column?

How many rows are in the array?

How could you count these counters without counting by ones?

How many counters are in each column?

How many rows are in the array?

How many counters are in each row?

How could you count these counters without counting by ones?

Guess My Array

Which array belongs to which student? Write the name of each student below their array.

Make an array using up to 25 counters, but don’t let your partner see.Give your partner clues about your array, so they can try to make it. Compare to see if your partnermade the same array.Be prepared to explain how you knew the total number of counters.

Show an array with 4 rows and 2 objects in each row.

How many columns are there? How many objects are in each column?

How many objects are there in all?

Make an array using up to 25 counters, but don’t let your partner see.Give your partner clues about your array, so they can try to make it. Compare to see if your partnermade the same array.Be prepared to explain how you knew the total number of counters.

Make an array using up to 25 counters, but don’t let your partner see.

Give your partner clues about your array, so they can try to make it.

Compare to see if your partner
made the same array.

Be prepared to explain how you knew the total number of counters.

Make an array using up to 25 counters, but don’t let your partner see.

Give your partner clues about your array, so they can try to make it.

Compare to see if your partner
made the same array.

Be prepared to explain how you knew the total number of counters.