Answers

Add 90/70 and 72/40

1^st number: 1 20/70, 2^nd number: 1 32/40

90/70 + 72/40 is 108/35.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 40 is 280
   
   Next, find the equivalent fraction of both fractional numbers with denominator 280
2. For the 1st fraction, since 70 × 4 = 280,
   90/70 = 90 × 4/70 × 4 = 360/280
3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
   72/40 = 72 × 7/40 × 7 = 504/280
4. Add the two like fractions:
   360/280 + 504/280 = 360 + 504/280 = 864/280
5. 864/280 simplified gives 108/35
6. So, 90/70 + 72/40 = 108/35
   In mixed form: 33/35

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