Subtraction Strategies with Base-10 Blocks and Place Value

The video tutorial demonstrates how to subtract 34 from 82 using base ten blocks and a place value chart. It begins by setting up the problem with 82 represented as eight tens and two ones. Since four ones cannot be subtracted from two ones, one ten is exchanged for ten ones, resulting in seven tens and twelve ones. The subtraction of four ones leaves eight ones, and the subtraction of three tens leaves four tens, resulting in the final answer of 48. The video concludes with a preview of the next tutorial, which will cover subtraction using bar models.

What is the initial step in subtracting 34 from 82 using base ten blocks?

• Subtract the tens place first

• Write down the numbers 82 and 34

• Subtract the ones place first

• Convert a ten block into ones

Why do we need to convert one of the ten blocks into ten one blocks?

• Because we have too many tens

• To make subtraction easier

• Because we cannot subtract 4 ones from 2 ones

• To increase the total number

After converting, how many tens and ones do we have?

• 6 tens and 11 ones

• 7 tens and 10 ones

• 8 tens and 12 ones

• 7 tens and 12 ones

How many ones are left after subtracting four ones?

• Eight ones

• Four ones

• Twelve ones

• Six ones

What is the result of subtracting 34 tens from 82?

• 68

• 58

• 38

• 48

What method will be used in the next video to help with subtraction?

• Mental math

• Number lines

• Bar models

• Using a calculator