Training Grounds
Tips & Tricks Hub
A printable cheat-sheet of number shortcuts, memory hooks, and mini facts.
Print the cheat-sheet act!
thinking
Make ten: 8 + 7 becomes 8 + 2 + 5.
Use doubles: 6 + 7 is double 6 plus 1.
Check division with multiplication.
For x5, count in fives or halve a x10 answer.
For subtracting 9, subtract 10 then add 1.
Did you know? Zero is an even number.
Did you know? A triangle is the strongest simple polygon for building frames.
Did you know? One thousand has three zeros.
Did you know? A square is also a rectangle because it has four right angles.
Tips
Make ten: 8 + 7 becomes 8 + 2 + 5.
Use doubles: 6 + 7 is double 6 plus 1.
Check division with multiplication.
For x5, count in fives or halve a x10 answer.
For subtracting 9, subtract 10 then add 1.
Practice Problems
1. Use a trick: 46 + 9 equals?
2. Use doubles: 7 + 8 equals?
3. Check 6 x 4 using division.
4. Find 9 x 5 using x10.
5. Subtract 9 from 63.