how could thinking about 90 tens help you find 1901-297?
I don't know, but estimating would be helpful.
1900 - 300 = 1600
How could thinking about 90 tens help you fing 1,901-297?
To find the difference between 1901 and 297, thinking about 90 tens can help by breaking down the numbers into their place value components.
First, let's convert 90 tens into a number. Since one ten is equivalent to 10, multiplying 90 by 10 will give you the value of 900.
Now, let's focus on the subtraction problem: 1901 - 297.
One approach is to use regrouping/borrowing method. Start from the right side of the numbers and subtract each place value column one at a time.
Starting with the ones place, we have 1 - 7. Since 1 is smaller than 7, we'll need to borrow from the tens place. By using 90 tens, we can reframe the 1 as 10 ones, making it 10 - 7 = 3.
Moving to the tens place, we had 9 tens but borrowed one ten (which is equivalent to 10 ones). So we now have 8 tens. Subtracting 8 - 9 gives us -1.
Finally, in the hundreds place, we have 1 - 2, which equals -1.
So, the difference between 1901 and 297 is -1604.
In summary, thinking about 90 tens allows us to reframe the original numbers as 900 and 297, making the subtraction easier to compute.