Decomposing Numbers and Subtraction

This video tutorial teaches how to subtract 10 from a three-digit number using base 10 blocks. It explains the composition of three-digit numbers and the role of hundreds, tens, and ones. The tutorial demonstrates how to decompose a hundred into ten tens when the tens place is zero, allowing subtraction of 10. Examples are provided to illustrate the process, ensuring a clear understanding of subtracting 10 across 100.

What is the main challenge when subtracting 10 from a number with no tens in the tens place?

• Finding the correct number to subtract

• Adding extra tens to the number

• Decomposing a hundred into tens

• Understanding the concept of base 10 blocks

What are the components of a three-digit number?

• Thousands, hundreds, and tens

• Hundreds, tens, and ones

• Tens, ones, and fractions

• Hundreds, thousands, and ones

How many ones are there in a ten long?

• 20

• 5

• 10

• 15

What does it mean to decompose a hundred flat?

• To convert it into ones

• To break it into ten tens

• To remove tens from it

• To add more tens

In the example of 203 minus 10, what is the first step?

• Multiply the number by 10

• Subtract 10 directly

• Decompose a hundred into tens

• Add more ones

After decomposing 203, how many tens are left after subtracting 10?

• 8

• 9

• 10

• 11

In the example of 409 minus 10, what is the initial composition of the number?

• Four hundreds, zero tens, nine ones

• Four hundreds, nine tens, nine ones

• Four hundreds, nine tens, zero ones

• Four hundreds, zero tens, zero ones

What is the result of 409 minus 10 after decomposition?

• 389

• 399

• 389

• 399

Why is decomposition necessary in the example of 409 minus 10?

• Because there are no hundreds to subtract

• Because there are extra tens

• Because there are no ones to subtract

• Because there are no tens to subtract

What is the final composition of the number after subtracting 10 from 409?

• Three hundreds, nine tens, nine ones

• Three hundreds, eight tens, eight ones

• Three hundreds, eight tens, nine ones

• Three hundreds, nine tens, eight ones