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.

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

   10/3
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.

   Kira's fraction (drawn in glitter pen) has 3x + 1 on the top and 2 on the bottom. Do the whole top first. What is its value when x = 5?

   8
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.

   Noah's fraction (with a tiny hat on top) has 6x − 4 on the top and 10 on the bottom. Do the whole top first. What is its value when x = 4?

   2
7. 7.

   Pia puts x = −2 into |x − 6| (while a snail watches). The first line is (−2) − 6. Work the inside, then the bars. What is the value?

   8
8. 8.

   Ren puts x = −7 into |x + 3|. The first line is (−7) + 3. Work the inside, then the bars. What is the value?

   4
9. 9.

   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
10. 10.

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

    6