Week 03 · Percents

Thursday

The sign-up sheet

// A rate per 100

⏱ about 20 min

Thursday: The Sign-Up Sheet

Raven pins the finished sign-up sheet above the Numbers Desk. "Forty kids. Four games. Every kid picked one."

Rocket reads the tallies. "Relay 10. Hoops 16. Sack hop 8. Puzzle 6."

"Hoops wins," he says. "Sixteen is the most."

"What do you notice if you say each one as a percent?" Raven asks.

Rocket scales each fraction to 100. "Relay 25%. Hoops 40%. Sack hop 20%. Puzzle 15%."

Nova hovers near the sheet, her light pausing on the last column. "What do the four percents add to?"

"One hundred," Rocket says. "Every kid is in there exactly once. That is how I know I did it right."

Read the sheet

These counts are the crew's own made-up Field Day sign-ups. The whole is 40 kids, the 100%.

Each game's count is a part. Scale each part to 100 to get its percent, or divide by 40 and multiply by 100.

The percents of the parts add to 100% when every kid chose exactly one game. That is a built-in check.

Game	Sign-ups	Fraction of 40	Percent
Relay	10	10/40	25%
Hoops	16	16/40	40%
Sack hop	8	8/40	20%
Puzzle	6	6/40	15%

$A bar graph of sign-ups: Relay 10, Hoops 16, Sack hop 8, Puzzle 6$

PERCENT OF THE SIGN-UPS

Read the question.
Tap your answer.

Relay got 10 of the 40 sign-ups. What percent is that?

Hoops got 16 of the 40 sign-ups. What percent is that?

Sack hop got 8 of the 40 sign-ups. What percent is that?

Puzzle got 6 of the 40 sign-ups. What percent is that?

PLAN WITH PERCENTS

Read the question.
Tap your answer.

12 kids want to help set up the relay. That is 30% of the helpers. How many helpers are there?

25% of the 40 kids want a second round of their game. How many kids is that?

Half of the 16 Hoops kids want to be team captains. How many kids is 50% of 16?

Puzzle's 6 sign-ups were 15% of the sheet. How many kids signed up in all?

Number sentence	True or false?
10/40 = 25/100	?
16/40 = 60/100	?
8/40 = 20/100	?
6/40 = 15/100	?

WHY THIS EXERCISEEach row of the sheet is a part of 40 turned into a part of 100.

Percent of sign-ups that chose Hoops

Percent of sign-ups that chose Puzzle

Percent that chose Relay or Sack hop together

What the four percents add up to

Try it

Ask four or five family members which of the four games they would pick. Record only the choices.
Turn each count into a percent of your total. Do the percents add to 100?

Safety first

Ask only family and friends your family already knows. Record the game picked, never who picked it.

Draw the sign-up sheet as a hundred grid, shading each game a different color so the percents add to 100%.

Numbers Notebook: Rocket knew his percents were right because they added to 100. Explain why that check works.If 20 more kids sign up next week, write how the percents might change even if Hoops stays the favorite.Which is easier to compare, the counts or the percents? Write one reason for each side.

Sharp reading. Tomorrow you find percents all around you and review the week.

Grown-up checked my answers

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