Adding and Subtracting 10 Using a Number Chart and Place Value Model

This video tutorial teaches how to add or subtract 10 from 3-digit numbers using a number chart. It begins with a review of number ranges and then explains adding and subtracting 10 from 2-digit numbers. The tutorial explores patterns on the 101 to 200 chart and demonstrates adding and subtracting 10 from 3-digit numbers. The lesson concludes with a summary of the key concepts.

What is the largest 2-digit number?

• 90

• 100

• 89

• 99

When adding 10 to a 2-digit number, which digit changes?

• None

• Hundreds

• Ones

• Tens

What is 148 plus 10?

• 178

• 158

• 148

• 168

If you add 10 to 172, what is the result?

• 182

• 172

• 192

• 162

What is 365 plus 10?

• 375

• 365

• 385

• 355

What is 175 minus 10?

• 165

• 175

• 155

• 185

When subtracting 10 from 365, which digit changes?

• Hundreds

• Tens

• None

• Ones