Worksheets › Class 7 › Finding the Unknown
Class 7 Finding the Unknown worksheet
CBSE Mathematics. Solving simple equations and writing them from word problems. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
The solution of 7x + 17 = 38 is:
- x = 21
- x = 4
- x = 7 6/7
- x = 3
Answer
(d) x = 3
7x = 38 − 17 = 21, x = 3
- 2.
"9 more than a number y is 20" as an equation is:
- y + 9 = 20
- 9y = 20
- y − 9 = 20
- y = 20 + 9
Answer
(a) y + 9 = 20
- 3.
Which value of x satisfies 3x − 2 = 13?
- 4
- 15
- 6
- 5
Answer
(d) 5
3 × 5 − 2 = 13
Section B · short answer
- 4.
Solve: 9x − 14 = 31
Answer
x = 5
9x = 31 + 14 = 45; x = 45 ÷ 9 = 5
- 5.
Solve: 8x − 19 = −51
Answer
x = −4
8x = −51 + 19 = −32; x = −32 ÷ 8 = −4
Section C · long answer
- 6.
The length of a rectangle is 5 cm more than its breadth. Its perimeter is 66 cm. Find the length and breadth.
Answer
breadth = 14 cm, length = 19 cm
2(b + 5 + b) = 66 → 4b + 10 = 66 → 4b = 56 → b = 14
Fresh sheets for your child
In the app, every Finding the Unknown sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.