Do the sum mentally:
90 + 60 =
90 + 60 = 150
A jump from 2 to 12 is like taking ______ steps.
10 less than 34 is ______.
53 – 20 = ______
11 more than 31 is ______.
11 less than 66 is ______.
______ + 26 = 75
See if you can do the same with these sums.
56 + 21 =
345 + 52