Place Value: Ones, Tens & Hundreds

40.

52.

4 tens blocks and 7 ones blocks.

8 tens or 80; 8 is in the tens place, so its value is 8 tens or 80.

When I add 1 to 79, I add 1 to the 9 in the ones place and get 10. I write a 0 in the ones column and regroup 10 ones as 1 ten. Now I have 8 tens or 80. So when I add 1 to 79, I get 80.

The digit 3 has a value of 3 hundreds, or 300, because it is in the hundreds place. The digit 7 has a value of 7 tens, or 70, because it is in the tens place. The digit 8 has a value of 8 ones, or 8, because it is in the ones place.

2 hundreds blocks, 5 tens blocks, 6 ones blocks.

405.

425; there are 12 tens. I can’t write a 2-digit number like 12 in the tens place, so I write 2 in the tens place and regroup 10 tens to be 1 hundred. Now I have 1 more hundred in the hundreds place.

When I add 1 to 399, I add 1 to the 9 in the ones place and get 10. I write a 0 in the ones column and regroup 10 ones as 1 ten. Now I have 10 tens, so I write a 0 in the tens column and regroup 10 tens as 1 hundred. Now I have 4 hundreds. So when I add 1 to 399, I get 400.