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Find the last digit of 23729 × 78900
1. 7
2. 3
3. 0
4. 8

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Correct Answer - Option 4 : 8

Given:

Last digit of 23729 × 78900

Calculation:

⇒ 23729 = (23)728 × 23 = (232)364 × 23

The last digit of 232 is 9 and last digit of 23 = 3.

Similarly,

⇒ 78900 = (2 × 39)900 = (210)90 × (392)450

The last digit of 210 = 4 and last digit of 392 = 1

∴ Last digit of 23729 × 78900 = 9 × 3 × 4 × 1 = 108 which is 8.

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