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.

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Solution

(a) (8 x 5) – 7
(b) (8 + 5) – 7
(c) (8 x 7) – 5
(d) (8 + 7) – 5
(e) 5 x (7 + 8)
(f) 5 + (7 x 8)
(g) 5 + (8 – 7)
(h) 5 – (7 + 8)
(i) 5- (7 - 8)
(j) 5 + (7 - 8)

Similarly, more expressions could be made.

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Similar questions

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.

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.)

Q. How many numbers with not more than three digits can be formed using only the digits

1

through

7

with no digit used more than once in a given number?

Question 6(ii)

Form expressions using y, 2 and 7. Every expression must have y in it.Use only two operators out of addition,multiplication,subtraction and division.

(a) Form expressions using t and 4. Use not more than one number operation. Every expression must have t in it.

(b) Form expressions using y, 2 and 7. Every expression must have y in it. Use only two number operations. These should be different.

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Forming simultaneous linear equations

Standard XII Mathematics

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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.

(a) (8 x 5) – 7 (b) (8 + 5) – 7 (c) (8 x 7) – 5 (d) (8 + 7) – 5 (e) 5 x (7 + 8) (f) 5 + (7 x 8) (g) 5 + (8 – 7) (h) 5 – (7 + 8) (i) 5- (7 - 8) (j) 5 + (7 - 8) Similarly, more expressions could be made.

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.

(a) (8 x 5) – 7
(b) (8 + 5) – 7
(c) (8 x 7) – 5
(d) (8 + 7) – 5
(e) 5 x (7 + 8)
(f) 5 + (7 x 8)
(g) 5 + (8 – 7)
(h) 5 – (7 + 8)
(i) 5- (7 - 8)
(j) 5 + (7 - 8)

Similarly, more expressions could be made.