Explain what happens to the number of hundreds and tens when 10 tens are regrouped as 1 hundred.

When you regroup 10 tens into 1 hundred, the number of tens decreases by 10 since you're taking them away to create a hundred. So, if you previously had, say, 7 hundreds and 10 tens, after regrouping, you would have 8 hundreds and 0 tens. It's a neat way to see how numbers can shift and combine, reinforcing our understanding of place value! Think of it like packing! If you have a box containing 10 smaller boxes (the tens) and you combine them into a single larger box, you’re left with just 1 large box (the hundred), but you’ve lost those smaller boxes in the process. It’s just a fun and tidy way to keep everything organized!