adding on tens by Deva

Learning Intention: W.A.L.T-add tens to any number by counting in tens or adding ten together
Success Criteria:I know I am successful when I can add tens together.


Problems:
1. 40 carvings+20 carvings =60 carvings
 I know that 4 tens +2 tens =6 tens
2. 37 bananas +40 bananas=77 bananas
 I know it's 77 because 30+40=70+7=77
3.6+4+2+7+8=27
 I know it's 27 because 6+4=10 2+8=10 so,10+10=20+7=27