Practice the questions given in the worksheet on subtraction of unlike terms. We know that, the difference between one like term from the other like term can be express as a single like term but in case of unlike terms we cannot subtract them from one another to express the result as a single term.
1. Find the difference of:
(i) 9n from 13m
(ii) 7a^{2} from 7ab2. Subtract the following:
(i) from 5pq take p
(ii) from 11a^{2}bc take 5abc(v) from 17mn take 9n
(vi) from 21xy take 21ab
3. Subtract the first term from the second term:
(i) 9a, 11b
(ii) 7ab, 3b^{2}(iii) 5y, 3x
(iv) 11mn, 21m
(v) pq, ab
(vi) 23pqr, 23pq
4. Evaluate the following:
(i) 2x + 5y  3y
(ii) a + b + a  b
(iii) 6xy  8y  3xy
(iv) 8x  5y  7x + 10y
(v) 5ax  9ax  7ay
(vi) x^{2}  y^{2}  x^{2}5. What is the difference between 11pq and 9p?
6. How much is 7m + 5n greater than 3n?
Answers for the worksheet on subtraction of unlike terms are given below to check the exact answers of the above questions on subtracting unlike terms.
Answers:
1. (i) 13m  9n
(ii) 7ab  7a^{2}2. (i) 5pq  p
(ii) 11a^{2}bc  5abc(iii) 9bc  9ac
(iv) x^{2}  y^{2}(v) 17mn  9n
(vi) 21xy  21ab
3. (i) 11b  9a
(ii) 3b^{2}  7ab(iii) 3x  5y
(iv) 21m  11mn
(v) ab  pq
(vi) 23pq  23pqr
4. (i) 2x  2y
(ii) 2a
(iii) 3xy  8y
(iv) x + 5y
(v)  14ax  7ay
(vi)  y^{2}5. 11pq  9p
6. 7m + 2n
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