Maths Problems - Follow Up Maths Day 2

Day 2
WALT: I am learning to add three or more numbers by first making up pairs that add up to 10.

1 + 5 + 5 + 9 =            5 + 5 = 10     9 + 1 = 10        10 + 10 = 208 + 6 + 4 + 7 + 2 =      8 + 2 = 10    6 + 4 = 10       10 + 10 = 20    20 + 7 = 277 + 8 + 4 + 3 + 2 =      7 + 3 = 10     8 + 2 = 10        10 + 10 = 20     20 + 4 = 245 + 2 + 3 + 7 +8 =        7 +  3 = 10      8 + 2 = 10       10 + 10 = 20       20 + 7 = 278 + 6 + 4 + 7 +2 =         6 + 4 = 10        8 + 2 = 10       10 + 10 = 20       20 + 7 = 27

Today my group for maths had to solve out these problems. We had to add three or more numbers by first making up pairs that add up to 10.