Yesterday we blogged about rounding up and down to the nearest 10 and said that we would find out if our rules applied to rounding to 100s.
Today we checked and then made up rules for rounding to the nearest 100.
We found out that when rounding to the nearest 100 it is not about the units it is the tens which are important.
It is the same rule but you apply it to the tens digit rather than the units.
So, if the number has 0,1,2,3 or 4 tens you round down. If it has 5,6,7,8 or 9 tens you round up.
Here are some of our thoughts from today:
Jake:It is always the second digit from the left which is important when you are rounding. So, when you are rounding to the nearest 1000 it is the 100s digit which is important.
Keavie: We played a game about rounding to the nearest 100 and we did very well with it.
Lorna: When rounding to the nearest hundred the 10s unit tells you whether to go up or down to the nearest 100.
Jake I really like your description of rounding. That is a great rule. Excellent learning P4.