Solutions by everydaycalculation.com

1645 + 3670 is 274315.

- Find the least common denominator or LCM of the two denominators:

LCM of 45 and 70 is**630**

Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,

1645 = 16 × 1445 × 14 = 224630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,

3670 = 36 × 970 × 9 = 324630 - Add the two like fractions:

224630 + 324630 = 224 + 324630 = 548630 - 548/630 simplified gives 274315
- So, 16/45 + 36/70 = 274/315

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