Start here

You did these with your group. Now do them on your own — the model above is yours to copy.

1. 1

   Same stepsFinish what the group started. Use the model above, step for step.

   Try it together — then prove it: Find 40% of 80. Step 1 — what is the base? (80, the number after “of”) Step 2 — 40% as a decimal? (40 ÷ 100 = 0.40) Step 3 — multiply: 0.40 × 80 = ? (32) Does 32 make sense? 40% is a little less than half, and half of 80 is 40. ✓ Now prove it: say why that move had to work at all — not just that it did.

   Show your work
2. 2

   Warm restartWhich benchmark percent is closest to 9%?

   1. A10%
   2. B1%
   3. C25%
   4. D50%

   How do you know?
3. 3

   Warm restartEstimate 24% of 80 using a benchmark percent.

   1. Aabout 20
   2. Babout 24
   3. Cabout 40
   4. Dabout 8

   How do you know?
4. 4

   Warm restartA jacket costs $39.75. Estimate a 20% discount.

   1. Aabout $8
   2. Babout $4
   3. Cabout $20
   4. Dabout $2

   How do you know?

You answered these out loud. Now write them.

Answer, then say how you know — the reason is the part that counts.

1. 5

   Think it throughWhat is 12% written as a decimal?

   1. A0.12
   2. B1.2
   3. C12
   4. D0.012

   Why is that the answer?
2. 6

   Think it throughWhat is 12% of 1,500 tickets?

   1. A180
   2. B18
   3. C1.8
   4. D1,800

   How do you know? Give a second reason as well.
3. 7

   Think it throughCheck with a benchmark: what is 10% of 1,500?

   1. A150
   2. B15
   3. C1.5
   4. D100

   Explain your thinking. What would have to change for a different choice to be right?
4. 8

   Back to the modelWhat steps do you follow every time you find the percent of a number?

Use the words

Fill each blank with a word from the bank.

• A part found by multiplying a number by a percent in decimal form is the ___ ___ ___ ___.
• A number out of 100 is a ___.
• The whole amount you start with, right after the word “of,” is the ___.
• The amount you get out of the whole is the ___.

Explain the thinking

1. 9

   Find the mistakeAnother student made this exact mistake in this lesson. Explain why it is wrong, then write what they should have done.

   The mistake: A common mistake in Find the Percent of a Number is multiplying by the percent number itself instead of its decimal form — for example, finding 30% of 80 by computing 30 × 80 = 2,400 instead of 0.
2. 10

   Say moreWhat steps did you follow every time to find the percent of a number in the discount table?
3. 11

   Write your ownWrite your own problem about this situation, then solve it and show the answer. The situation: Five phone battery icons are lined up in order. The first is full at 5 bars out of 5, and each one after it has one fewer bar. The last icon has 1 bar left, and the caption says about 1 hour remains.

   Show your work

Last check

These two come from Lesson 4.3. If they are shaky, that is the lesson to revisit — not this one.

1. 12

   Show what you knowExplain your thinking — What is 45% of 360?

   1. A162
   2. B45
   3. C315
   4. D180

   Explain your choice.
2. 13

   From Lesson 4.3Explain your thinking — Estimate 19% of 412 using benchmarks or compatible numbers.

   1. AAbout 80
   2. BAbout 8
   3. CAbout 200
   4. DAbout 40

   How do you know?
3. 14

   From Lesson 4.3Photos take up 3.5 of the 4 GB of used storage. About what percent of the used storage is photos?

   1. AAbout 87%
   2. BAbout 58%
   3. CAbout 35%
   4. DAbout 99%

   How do you know?

Be honest — this tells your teacher what to do next