Show that you can use mental math strategies and number properties to add and subtract numbers with answers to 18...

Alien AdditionMinus MissionFun 4 the Brain

Number Line


by using doubles and near doubles

Dinosaur Dentist
by making 10

Math Lines 10Math Lines 20
Catapult


by using the commutative property

Number Balance
by using the property of zero


by thinking addition for subtraction

Number Line Bounce