Counting Quickly with Arrays

The video tutorial teaches repeated addition using arrays. It begins by explaining the concept of arrays, highlighting common misunderstandings, such as the inability to form certain arrays with specific numbers. The tutorial provides examples using numbers, strawberries, and Xs to demonstrate how to calculate the total number of items in an array by adding columns and rows. The lesson concludes by reinforcing the concept of repeated addition through arrays.

What is a common misunderstanding when creating arrays with certain numbers?

• Arrays can be made with any number.

• Arrays must have equal rows and columns.

• Arrays can be made with any number of rows.

• Arrays cannot be made with prime numbers.

How many total boxes are there in an array with 4 columns and 5 rows?

• 24

• 22

• 20

• 18

When adding by columns, what is the sum of 4 fives?

• 15

• 18

• 22

• 20

How many strawberries are there in an array with 2 strawberries per column and 4 strawberries per row?

• 6

• 12

• 8

• 10

In an array of Xs with 3 Xs by 4 Xs, what is the total number of Xs?

• 10

• 11

• 13

• 12