2017 Grade 7 Math Challenge Elimination Round - Part 1(Questions with answer)

2017 Grade 7 Math Challenge Elimination Round – Part 1(Questions with answer)

This is the 2017 MTAP Grade 7 Math Challenge questions 1 to 25. Questions 26-30 including the pdf can be found here.

Questions in the previous years can be accessed on the Past Tests page and all questions can be found in the All Posts page.

1.) If A= {1,3,5,7}, B = {3,7,11} and C ={3,11,19}, find A ∩ (B ∪ C).

2.) Let A = {a, b, c ,d }, B = {a, d, e, f } and C = {c, x} be the subsets of {a, b, c, d, e, f }. Find all possible x so that (A ∪ C) ∩ B has exactly three elements.

3.) Give the fraction form of $2. \overline{16}$ .

4.) Give the rational number that is midway between $\dfrac{3}{4}$ and $\dfrac{7}{8}$

5.) Anna walks $\frac{32}{7}$ due west, then turns back and walks $5 \frac{5}{7}$ km due west. How far is Anna from her starting point?

6.) Write the answer as a decimal: $\frac{5}{13} \div \frac{-4}{39}$ .

7.) In the number line below, the interval [−2, −1] and [2, 3] are each divided into equal parts. Find the distance between A and B.

8.) If X and Y are two sets such that X ∪ Y has 16 elements, X has 10 elements and Y has 13 elements, how many elements does X ∩ Y have?

9.) In a class, 34 play basketball, 22 play volleyball, 8 play both both sport, and 5 play neither. How many students are in the class?

10.) If $a = 21$ and $b=-16$ , find $2a + 3b$ .

11.) Integers x and 3 differ by 8. What value/s can $x$ have?

12.) The sum of integers $-x$ and 6 is −3. What value/s can x have?

13.) Evaluate: $\dfrac{86}{-42 + (-10)}$ .

14.) Evaluate: 6(28739) + 28739(4).

15.) Between which two integers does $\sqrt{200}$ lie?

16.) What is $12 \sqrt{15} \div 4 \sqrt{3}$ ?

17.) Estimate $\sqrt{18}$ to the nearest tenth.

18.) Arrange the following numbers in increasing order: 3.14, 3.141, 3.14, π.

19.) A bunch of peeled bananas weighs 4 kilograms. If this is to be divided into 25 servings, how many grams would each serving be?

20.) If cloth costs P 200 per yard, how much is the cost per meter? You may express your answer in fraction form. [Use 1 ft= 61/200m].

21.) Write the following expression in symbols: ”Seven subtracted from five times the sum of $2x$ and $y^2$ ” Do not simplify.

22.) Find the sum of $-x+3y$ and half of $6x - 2y + 1$ . Simplify.

23.) Insert parenthesis in the expression of a − b · 2a + 1 so that it becomes equal to $2a^2 - 10a + 1$ .

24.) Simplify $5x + 3 [ 3x -- 6(x + 1)]$ .

25.) In the expansion of $(x - 3y + 2)^2$ , what is the coefficient of $xy$ ?

Answers:

1.) (3, 7)
2.) $e, f$
3.) $\frac{214}{99}$
4.) $\frac{13}{16}$
5.) $\frac{8}{7} km$
6.) -3.75
7.) $\frac{43}{12}$
8.) 7
9.) 53
10.) -6
11.) -5, 11
12.) 9
13.) -2
14.) 287390
15.) 14, 15
16.) $3\sqrt{5}$
17.) 4.2
18.) $3.14, 3.141, \pi, 3.1\bar{4}$
19.) 160
20.) $Php \frac{40000}{183}$
21.) $5(2x + y^2) - 7$
22.) $2x + 2y + \frac{1}{2}$
23.) (a – 5)2a + 1
24.) -4x – 18
25.) -6