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Worksheet Solutions: Playing with Numbers | Mental Mathematics for Class 8 PDF Download

Q1: Use <, >, or =. seventeen million seventeen thousand seventy-six ____ 17 170 076
Ans:
<

Q2: Express in standard form: fifty-four thousand, seven hundred two
Ans:
54 702

Q3: Express in standard form: three hundred thirty million, forty-nine thousand, eleven
Ans:
330 049 011

Q4: What is the area of a square tabletop with a side length of 40 cm?
Ans: 
1600 cm2
0.16 m2


Q5: A $20 debt is shared equally among five students. How much does each student owe?
Ans:
 $4

Q6: A shed covers an area of 24 square metres in a 10 m by 10 m green space. What is the size of the green space not covered?
Ans:
76 m2

Q7: How much longer is the side length of a square that has an area of 81 cm2 than one that has an area of 36 cm2?
Ans: 
3 cm

Q8: Solve and simplify: √25 - √36
Ans:
-1

Q9: A square has an area of 100 cm2. What is the perimeter?
Ans: 
40 cm

Q10: Starting at 1 x 1 on a multiplication chart, in what direction do the perfect squares all form a straight line?
Ans:
Diagonally downward and to the right

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