9514 1404 393
Answer:
ii)
- 36 -16 = 20
- 6 -5 = 1
- 30 -11 = 19
iii)
- 15 -6 = 9
- 5 +2 = 7
- 20 -4 = 16
Explanation:
Straightforward addition and subtraction. You could do this in 2nd grade. Work from lower right to upper left.
ii) 30 -11 = 19; 6 -5 = 1 . . . . bottom two rows
20 -1 = 19; 16 -5 = 11 . . . . right two columns
36 -16 = 20 . . . . top row
Check
36 -6 = 30 . . . . left column
Then the solution by row is ...
- 36 -16 = 20
- 6 -5 = 1
- 30 -11 = 19
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iii) Same deal, working from lower right.
20 -4 = 16 . . . . bottom row
9 +7 = 16 . . . . right column
6 -2 = 4 . . . . middle column
5 +2 = 7 . . . . middle row
15 -6 = 9 . . . . top row
15 +5 = 20 . . . . left column
The solution by row is ...
- 15 -6 = 9
- 5 +2 = 7
- 20 -4 = 16