what is this number, 64, 46, 36, what is this number?, 30= 3 tens, 40= 4 tens, 10= 1 ten, Find the sum, 50, 60, 70, 30+40=, 70, 80, 50, Find the sum, 87, 70, 67, 23+10, 33, 275, 11, 50, 67, 75

Two digit addition

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