Repeated Addition and Arrays

This video tutorial for second-grade students covers the basics of arrays, focusing on rows and columns. It explains how arrays relate to repeated addition and provides practice with vocabulary such as 'array', 'rows', and 'columns'. The lesson uses visual aids like smiley faces to help students understand the concepts. The tutorial also includes exercises on adding rows and columns to arrays, emphasizing the importance of these foundational skills for future math learning.

What are the three key vocabulary words introduced in this lesson?

• Numbers, Letters, Symbols

• Array, Rows, Columns

• Addition, Subtraction, Multiplication

• Shapes, Sizes, Colors

Why is it not a big deal if students mix up rows and columns at this stage?

• Because it's foundational work for third grade

• Because it's too difficult

• Because they will never need it

• Because it's not important

How many rows are there in the example given in the lesson?

• Five

• Four

• Three

• Two

What is the total when you add three rows of four?

• Twelve

• Ten

• Fourteen

• Eight

How do you calculate the total using columns in the example?

• By adding 6 plus 6

• By adding 5 plus 5

• By adding 3 plus 3 plus 3 plus 3

• By adding 4 plus 4

What is the total when you add four columns of three?

• Eleven

• Twelve

• Ten

• Nine

How many rows of smiley faces are there in the new array?

• Five

• Four

• Three

• Two

What is the total when you add three rows of five smiley faces?

• Twenty

• Fifteen

• Twenty-five

• Ten

How many columns of smiley faces are there in the new array?

• Five

• Four

• Three

• Two

What is the total when you add five columns of three smiley faces?

• Twenty

• Fifteen

• Twenty-five

• Ten