Addition and subtraction

list
Being collaborative - Primary number

Age

5 to 11

Challenge level

Number problems at primary level to work on with others.
list
Being resilient - Primary number

Age

5 to 11

Challenge level

Number problems at primary level that may require resilience.
list
Being resourceful - Primary number

Age

5 to 11

Challenge level

Number problems at primary level that require careful consideration.
problem
Impossibilities

Age

11 to 14

Challenge level

Just because a problem is impossible doesn't mean it's difficult...
problem
Forwards add backwards

Age

11 to 14

Challenge level

What happens when you add a three digit number to its reverse?
problem
Add to 200

Age

11 to 14

Challenge level

By selecting digits for an addition grid, what targets can you make?
problem
Cryptarithms

Age

11 to 14

Challenge level

Can you crack these cryptarithms?
game

First connect three for two

Age

7 to 11

Challenge level

First Connect Three game for an adult and child. Use the dice numbers and either addition or subtraction to get three numbers in a straight line.
$Got \It for Two$

game

Got it for two

Age

7 to 14

Challenge level

Got It game for an adult and child. How can you play so that you know you will always win?
game

Nice or nasty for two

Age

7 to 14

Challenge level

Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.