GMAT tests your logical skills as well as your knowledge of math concepts. To score high, you need to remember various formulas, theorems. Also you need to master critical problem-solving skills.

Today I am going to take you through one problem -solving skill –

**Attention to detail**

## Take this problem .

I am going to show you, two ways to solve this sum

**Method 1 : The traditional approach**

You need to choose the numbers which negate each other

For example Row 6 column 6 = 36.

Row 5 column 6 = -30 and Row 1 column 6 is -6

So 36+ (-30-6) =0.

You need to choose the right numbers

Add the remaining numbers you will get the answer

I have highlighted the different combinations with letters

I have highlighted the different combinations with letters

1J | -2I | 3H | -4J | 5D | -6A |

-2 | 4G | -6C | 8G | -10I | 12I |

3J | -6B | 9H | -12H | 15E | -18B |

-4F | 8G | -12F | 16F | -20E | 24B |

5E | -10 | 15 | -20G | 25D | -30D |

-6 | 12 | -18C | 24C | -30A | 36A |

Numbers left = 12 15 -6 -10 -2

Sum = 9

This method takes a long time

**Method 2: Pattern recognition**

This approach is a lot faster.

If you look at the numbers column-wise can you see a pattern(ignore signs)

column 1: 1 2,3,4,5,6

column 2: 2×1,2×2,2×3,2×4,2×5,2×6

.

.

column 6: 6×1,6×2,6×3………..6×6

When the signs are inserted, then a pattern emerges i.e. = 1-2+3-4+5-6

lets calculate the sum of the repeating pattern 1-2+3-4+5-6 = -3

Hence column 1 adds upto -3

Next column will be -2+4-6+8-10+12 = -2 x(1-2+3-4+5-6)= -2x-3 = 6

Next column will be 3 x(1-2+3-4+5-6)= 3 x-3 = -9

Next column will be -4 x(1-2+3-4+5-6)= -4 x-3 = 12

Next column will be 5 x(1-2+3-4+5-6)= 5 x-3 = -15

Next column will be -6 x(1-2+3-4+5-6)= -6 x-3 = +18

Answer = -3+6-9 +12-15+18 = 9

If you want to maximize your math scores in the GMAT.. Lets have a chat…

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Lets try another sum