Ms. Jacoby's Second Grade
September Math Facts Goal:
Learn all "10" Addition/Subtraction Facts
and Tens Trick
1+9=10
9+1=10
10-1=9
10-9=1
2+8=10
8+2=10
10-2=8
10-8=2
3+7=10
7+3=10
10-3=7
10-7=3
4+6=10
6+4=10
10-4=6
10-6=4
5+5=10
10-5=5
Have fun practicing
your math facts online
at Math Counts.
Remember: Learn="Instant" Answer

Tens Trick
The Tens Trick is easy. Whenever the numbers 0-9 are added to ten that number just slides into the ones place.
10+0=10
10+1=11
10+2=12
10+3=13
10+4=14
10+5=15
10+6=16
10+7=17
10+8=18
10+9=19
Challenge: What is 10+10?
Does the Tens Trick work for 20?
Should we call it the "Twenties Trick"?
What about 30, 40, 50, 60, 70, 80, 90?