Make up asmany expressions with numbers (no variables) as you can from threenumbers 5, 7 and 8. Every number should be used not more than once.Use only addition, subtraction and multiplication.
(Hint: Three possible expressions are 5 + (8 − 7), 5 − (8− 7), (5 × 8) + 7;
make theother expressions.)

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Solution

Manyexpressions can be formed by using the three numbers 5, 7, and 8.
Some ofthese are as follows.
5 ×(8 − 7)
5 ×(8 + 7)
(8 + 5) ×7
(8 −5) ×7
(7 + 5) ×8
(7 −5) ×8

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Similar questions

Make up as many expressions with numbers (no variables) as you can from three numbers 5, 7 and 8. Every number should be used not more than once. Use only addition, subtraction and multiplication.

(Hint: Three possible expressions are 5 + (8 − 7), 5 − (8 − 7), (5 × 8) + 7;

make the other expressions.)

Make up as many expressions with numbers (no variables) as you from three numbers 5, 7 and 8. Every number should be used not more than once. Use only addition, subtraction and multiplication.

Question 1

Make up as many expressions with numbers (no variables) as you can from three numbers 5, 7 and 8. Every number should be used not more than once. Use only addition, subtraction and multiplication.

Using commutativity and associativity of addition of rational numbers, express each of the following as a rational number:

(i) $\frac{2}{5} + \frac{7}{3} + \frac{- 4}{5} + \frac{- 1}{3}$

(ii) $\frac{3}{7} + \frac{- 4}{9} + \frac{- 11}{7} + \frac{7}{9}$

(iii) $\frac{2}{5} + \frac{8}{3} + \frac{- 11}{15} + \frac{4}{5} + \frac{- 2}{3}$

(iv) $\frac{4}{7} + 0 + \frac{- 8}{9} + \frac{- 13}{7} + \frac{17}{21}$

Question 2

In which of the following expressions only numbers are used:

(a) y + 3

(b) $(7 \times 20) - 8 z$

(c) $5 (21 - 7) + 7 \times 2$

(d) 5

(e) 3x

(f) 5-5n

(g) $(7 \times 20) - (5 \times 10) - 45 + p$

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Manyexpressions can be formed by using the three numbers 5, 7, and 8.Some ofthese are as follows.5 ×(8 − 7)5 ×(8 + 7)(8 + 5) ×7(8 −5) ×7(7 + 5) ×8(7 −5) ×8

Manyexpressions can be formed by using the three numbers 5, 7, and 8.
Some ofthese are as follows.
5 ×(8 − 7)
5 ×(8 + 7)
(8 + 5) ×7
(8 −5) ×7
(7 + 5) ×8
(7 −5) ×8