Evaluate expressions with fractions, decimals, absolute value and roots

Answer Key - Grade 9 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Ari's card (guarded by one proud pencil) shows 6x + 1/2. Put in x = 2/3: 6 × 2/3 + 1/2. What is its value?

   9/2
2. 2.

   Esme's card shows 10x + 1/4. Put in x = 3/5: 10 × 3/5 + 1/4. What is its value?

   25/4
3. 3.

   Jun's card shows 8x + 2/3. Put in x = 5/8: 8 × 5/8 + 2/3. What is its value?

   17/3
4. 4.

   Luz's fraction has 2x + 1 on the top and 5 on the bottom. Do the whole top first. What is its value when x = 7?

   3
5. 5.

   Milo's fraction has 5x + 6 on the top and 8 on the bottom. Do the whole top first. What is its value when x = 6?

   4.5
6. 6.

   Tala puts x = −6 into |x + 2.5|. The first line is (−6) + 2.5. Work the inside, then the bars. What is the value?

   3.5
7. 7.

   Zee puts x = −7/4 into |x − 1/4|. The first line is (−7/4) − 1/4. Work the inside, then the bars. What is the value?

   2
8. 8.

   Ari's card (a very square card) shows √x + 3. The root asks which number times itself makes x. What is its value when x = 49?

   10
9. 9.

   Esme's card shows √x − 2. The root asks which number times itself makes x. What is its value when x = 64?

   6
10. 10.

    Jun's card shows ∛x + 4. The root asks which number times itself three times makes x. What is its value when x = 216?

    10