Add,+Subtract,+&+Estimate

=Addition, Subtraction, and Estimating=

**In this unit we learn how to add bigger numbers and estimate to the closest zero number. There are some great games below to help you become a math expert.**
Please take a minute to go to the Discussion tab above, watch the short video, and post a number story!

Number bonds to 100 - choose a number that adds to the number on the screen to add up to the target number

Speed Grid Challenge - This addition game is a challenge, but it's a lot of fun! You have to be fast and the numbers are a little bigger than earlier games.

Grand Slam Math - word problem game using double digit addition and subtraction

Ghost Blaster 3 - This is a 2 person game, but you can be both players and get double practice! Enter your name(s) in the Player 1 and Player 2 box, then get started practicing some double digit addition.

Number line estimating - place the dot where it belongs on the number line

Estimating addition - multiple choice estimation game using double digit addition

4 digit addition practice - click start and then choose the answer for each 4 digit addition problem.

Double digit addition worksheet. To print: click "File" (at the top of your screen), then scroll down the drop down menu and click "Print". Printable answer sheet - don't print this until you've done the worksheet!

Rounding numbers - rounding and estimating mean the same thing for this worksheet. Just round to the closest zero number. Don't cheat by looking at the answers before you're done!

Double digit subtraction - practice problems for double digit subtraction. When you print, you will get the problem page and the answer page. __Don't look at the answers__ until you have done all of the problems!

Double digit addition - how to add two 2-digit numbers - be patient, it might take a minute to load.