Uget brainliest if answer correctly for question 1-2 estimate the sum or difference. use the bench marks 0 1/2 and 1 1. 23/40 - 11/30 2. simone measures the width of one cardboard strip as 1/2 yd. a second cardboard strip measures 5/6 yd in width estimate the combined width of the cardboard strips. for questions 3-4 find the exact sum or difference 3. 7/15 + 9/15 + 4/15 4. gerry spends 1/21 of her money on pencils and 2/21 on paper what fraction of money does she spend? give the answer in simplest form.