Mastering Two-Digit Addition with Regrouping

This video tutorial demonstrates how to use base 10 blocks to add two-digit and single-digit numbers, focusing on regrouping. It includes examples of adding 27 + 9, 45 + 7, and 79 + 3, showing how to organize and trade ones for tens to simplify addition.

What is the main focus of using base 10 blocks in this video?

• Dividing two-digit numbers

• Adding a two-digit number and a single-digit number with regrouping

• Multiplying single-digit numbers

• Subtracting two-digit numbers

How many tens and ones are there in the number 27?

• 3 tens and 7 ones

• 2 tens and 7 ones

• 2 tens and 9 ones

• 2 tens and 5 ones

What is the result of adding 27 and 9 using base 10 blocks?

• 34

• 35

• 36

• 37

How many tens and ones are there in the number 45?

• 4 tens and 7 ones

• 4 tens and 9 ones

• 4 tens and 5 ones

• 5 tens and 4 ones

What is the result of adding 45 and 7 using base 10 blocks?

• 51

• 52

• 53

• 54

What should students do before moving on to the next example?

• Solve a different problem

• Watch the video without pausing

• Skip the video

• Pause the video and get their base 10 materials

How many tens and ones are there in the number 79?

• 7 tens and 3 ones

• 7 tens and 5 ones

• 7 tens and 9 ones

• 8 tens and 9 ones

What is the result of adding 79 and 3 using base 10 blocks?

• 81

• 82

• 84

• 83

What is the purpose of regrouping in addition?

• To divide numbers

• To make a group of ten for easier addition

• To make multiplication easier

• To make subtraction easier

What should you do if you have more than ten ones?

• Leave them as they are

• Trade them for a ten

• Remove some ones

• Add more ones