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sqdancefan

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Answer:

ii)

  • 36 -16 = 20
  • 6 -5 = 1
  • 30 -11 = 19

iii)

  • 15 -6 = 9
  • 5 +2 = 7
  • 20 -4 = 16

Step-by-step 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

__

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
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