Math Problem

Learning Intention: We are learning to solve problems using simple addition strategies  

Success Criteria: I am successful when I can solve the problem by adding 10s

1. Emma has 99 pieces of lego to build her robot. She added another 40 How many pieces did she use in total?

I know its 139 because 90+40=130+9=139

2. 57+30=?

I know it’s 87 because because 40+40=80+7=87

3. 18+70=?

I know it’s 88 because 40+40=80+8=88

4. 35+5+20=?

I know it’s 60 because 30+30=60