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 \times 8)+7 $; make the other expressions.)
To do:
We have to make up as many expressions with numbers (no variables) as we can from three numbers 5,7 and 8.
Solution:
Some of the expressions formed by 5, 7 and 8 are as follows:
$5+(8-7)$
$5-(8-7)$
$5-(8+7)$
$(5 \times 8)+7$
$(5 \times8) - 7)$
$5 \times (8 + 7)$
$(7 + 5) \times 8$
$(8 – 5) \times 7$
$(8 + 5) \times 7$
$(7 – 5) \times 8$
Related Articles
- Which out of the following are expressions with numbers only?(a) \( y+3 \)(b) \( (7 \times 20)-8 z \)(c) \( 5(21-7)+7 \times 2 \)(d) 5(e) \( 3 x \),b>(f) \( 5-5 n \)(g) \( (7 \times 20)-(5 \times 10)-45+p \)
- Simplify the following expressions:\( (5+\sqrt{7})(5-\sqrt{7}) \)
- Simplify:\( \left(\frac{5}{8}\right)^{-7} \times\left(\frac{8}{5}\right)^{-4} \)
- Evaluate the following:$\frac{5}{8}$+$\frac{2}{7}$+$\frac{5}{8}$
- Which out of the following are expressions with numbers only?(a) $y+3$(b) $(7\times 20)-8z$(c) $5(21-7)+7\times2$(d) 5(e) 3x(f) $5-5n$(g) $(7\times 20)-(5\times 10)-45+p$
- Solve: $( \frac{( 2^{5})^{2} \times 7^{3}}{8^{3} \times 7})$.
- What should be added to $\frac{-7}{8}$ so as to get $\frac{5}{9}$?
- Compare the following numbers: $( 1)\ -7,\ -2$$( 2).\ 0, \frac{-9}{5}$$(3)\ \frac{8}{7}, 0$
- Draw the number line and represent the following rational numbers on it:$(i)$. $\frac{3}{4}$$(ii)$. $\frac{-5}{8}$$(iii)$. $\frac{-7}{4}$$(iv)$. $\frac{7}{8}$
- Find six rational number between $\frac{-5}{3} \ and \ \frac{-8}{7}$
- Simplify the following:$8^7 \times 8^2 \times (8^3)^2$
- Add the following rational numbers:(i)M/b> \( \frac{3}{4} \) and \( \frac{-5}{8} \)(ii) \( \frac{5}{-9} \) and \( \frac{7}{3} \)(iii) \( -3 \) and \( \frac{3}{5} \)(iv) \( \frac{-7}{27} \) and \( \frac{11}{18} \)(v) \( \frac{31}{-4} \) and \( \frac{-5}{8} \)(vi) \( \frac{5}{36} \) and \( \frac{-7}{12} \)(vii) \( \frac{-5}{16} \) and \( \frac{7}{24} \)(viii) \( \frac{7}{-18} \) and \( \frac{8}{27} \)
- Use the digits without repetition and make the greatest and smallest $4-$ digit numbers: $2,\ 8,\ 7,\ 4$.
- Write \( \frac{7}{8} \) as a decimal number.
- Use the given digits without repetition and make the greatest and smallest 4-digit numbers.a) 2, 8, 7, 4b) 9, 7, 4, 1c) 4, 7, 5, 0d) 1, 7, 6, 2e) 5, 4, 0, 3
Kickstart Your Career
Get certified by completing the course
Get Started