Question
Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)


(a) 19 + 11 = _____

(b) 23 + 9 = _____

(c) 12 + 10 = _____

(d) 77 +  40 = _____
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Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)


(a) 19 + 11 = _____

(b) 23 + 9 = _____

(c) 12 + 10 = _____

(d) 77 +  40 = _____