Solutions by everydaycalculation.com

1690 + 1870 is 137315.

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

LCM of 90 and 70 is**630**

Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,

1690 = 16 × 790 × 7 = 112630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,

1870 = 18 × 970 × 9 = 162630 - Add the two like fractions:

112630 + 162630 = 112 + 162630 = 274630 - 274/630 simplified gives 137315
- So, 16/90 + 18/70 = 137/315

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