2.NBT.8.+Mentally+add+10+or+100+...

Number and Operations in Base Ten 2.NBT 8. Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
 * Use place value understanding and properties of operations to add and subtract. **

Close to 100

TERC, **//Putting Together and Taking Apart//** "Working with a 100" (Investigation 2:1-4) "Capture 5" (Investigation 5: 2-3)

John Van deWalle and LouAnn Lovin, //T**eaching Student Centered Mathematics K - 3**//, pages 122 – 156 //**Bridges in Mathematics**: Numbers to 1000////; Place Value; Race to 10// April Albers, //**Hundreds Riddles**,// Oregon City Schools

Adding Multiples of 10

Hundreds Chart

Mental Math Practice

Add and Subtract on the Hundreds Board

Add Using a Hundreds Board


 * //Think Math lessons://** 10.7 - 10.8