4.NBT.4 Fluently add and subtract multi-digit whole numbers using a standard algorithm.
We use rounding to estimate sums and differences.
Use the highest place value of the smallest number to know which place value to round to.
Estimating helps us to know if our sum or difference is reasonable.
Use the highest place value of the smallest number to know which place value to round to.
Estimating helps us to know if our sum or difference is reasonable.
Virtual Manipulatives Website with place value blocks.
1. Need to "allow" Adobe Flash to run. 2. Click on Backgrounds. Select Workmats. Select thousands, hundreds, tens, and ones (last workmat). 3. Click on Manipulatives and select Place Value Blocks. 4. Click on small square at the bottom left of a block to see visually how it can be converted to a smaller place value. Ex. 1 ten = 10 ones 5. Use this to conceptually practice and understand regrouping. |