Mixed Practice: Add & Subtract Up to 1,000
π Signs! Giant Signs! Never trust the page. Your brain will want to add everything. You must circle the minus signs in red!
Do this: Read the concept below, then try the quiz or activity.
Concept
The ultimate test. You have to switch between the Addition rules (Carry the +1 to the top) and Subtraction rules (Borrow from the neighbor, write a tiny 1!).
π― The Two Universes: When you cross a plus (+) sign, you are in the Addition Universe: * Is it bigger than 9? Carry the 1! (+1).
When you cross a minus (-) sign, you are in the Subtraction Universe: * Does it need help? Knock on the neighbor. Cross it out! Make it smaller! Give a 10!
If you cross into the wrong universe, everything explodes.
Try it
Do not cross streams!
Instructions: Look at the sign. Are you carrying (+)? Or are you borrowing (-)?
Round 1: 4 8 2 + 2 5 1 --------- * Sign says: ______ (Universe: Carry!). * Answer: ___
Round 2: 8 3 4 - 2 1 9 --------- * Sign says: ______ (Universe: Borrow from neighbor!). * Answer: ___
Round 3: 9 0 5 - 1 4 2 --------- * Answer: ___
Round 4: 5 5 5 + 4 4 5 --------- * Answer: ___