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Some tricks for faster calculation:

1. Multiplying 5 times an even number: halve the number you are multiplying by and place a zero after the number.

Example:

i. 5 * 136, half of 136 is 68, add a zero for an answer of 680.

ii. 5 * 874, half of 874 is 437; add a zero for an answer of 4370.

2. Multiplying 5 times an odd number: subtract one from the number you are multiplying, then halve that number and place a 5 after the resulting number.

Example:

i. 343 * 5 =(343-1)/2 | 5 = 1715 .

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