Question

Luke regrouped 3 tens 8 ones as (blank) tens 18 ones. He should have regrouped 3 tens 8 ones as:

a) 2 tens 18 ones
b) 1 ten 18 ones
c) 4 tens 18 ones
d) None of the above

Answer 1

Luke should have regrouped 3 tens 8 ones as 2 tens 18 ones. Regrouping involves transferring value from one place value to another, and moving 1 ten to the ones place effectively leaves 2 tens and increases the ones to 18.

Step-by-step explanation:

When Luke regrouped 3 tens 8 ones as (blank) tens 18 ones, he used a process called regrouping or sometimes referred to as borrowing or carrying over in mathematics. To regroup correctly, you would take one ten from the tens place and move it to the ones place, since 10 ones are equivalent to 1 ten. This process would transform 3 tens 8 ones into 2 tens 18 ones.

Here is a step-by-step explanation:

1. Start with 3 tens (which is 30) and 8 ones (which is 8).
2. Take 1 ten (which is 10) from the tens place and move it to the ones place.
3. This will leave you with 2 tens (which is 20) and 18 ones (since 8 ones plus the 10 ones you shifted over makes 18).

Therefore, the correct answer to this question is option (a) 2 tens 18 ones.