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Number Trail Grade 5 / Week 05 / Friday
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Week 05 · Decimal operations

Friday

Freddy's decimal game
// Add, subtract, multiply and divide to hundredths
⏱ about 15 min

Friday: Freddy's decimal game

Freddy the Frog hops onto a lily pad with a stack of number cards.

"Ribbit! Welcome to the decimal pond," he says, straightening his bow tie.

"Each lily pad holds a decimal question. Some ask you to add or subtract."

"Others ask you to multiply or divide."

Bruce stretches his paws. "I am ready for a challenge," he says.

Bennie holds up his stick. "Remember to line up the places, and check your answers."

Freddy laughs. "Then let the game begin!"

Game 1: Add and subtract

FIND THE ANSWER
  • Read the question.
  • Tap your answer.
3.45 + 2.8 = ?
7.3 - 4.65 = ?
0.9 + 0.35 = ?
6 - 2.75 = ?

Game 2: Multiply and divide

FIND THE ANSWER
  • Read the question.
  • Tap your answer.
4 × 2.35 = ?
0.6 × 0.4 = ?
8.4 ÷ 4 = ?
3.6 ÷ 0.9 = ?

Game 3: Pick the operation

WHICH NUMBER SENTENCE FITS?
  • Read the question.
  • Tap your answer.
A frog hops 0.45 meter, then 0.6 meter more. How far in all?
Freddy has 2.4 liters of water to share into 6 equal pails. How much in each?
A log is 3.5 meters long. Freddy hops 1.2 meters along it. How far is left?
Each lily pad is 0.8 meter wide. How wide are 5 pads in a row?

Game 4: Earlier weeks

REMEMBER THESE?
  • Read the question.
  • Tap your answer.
Round 4.68 to the nearest tenth.
Round 7.349 to the nearest hundredth.
24 × 15 = ?
10 × 3.07 = ?
ORDER THE ANSWERS
  • Use your answers from Games 1 and 2.
  • Put the numbers from least to greatest.
11st
22nd
33rd
44th

Game 5: True or false?

SentenceTrue or false?
3.45 + 2.8 = 6.25?
0.6 × 0.4 = 2.4?
8.4 ÷ 4 = 2.1?
6 - 2.75 = 3.25?
WHY THIS EXERCISE0.6 × 0.4 is 0.24, because a tenth of a tenth is a hundredth.
Try it
Hop like Freddy and have a grown-up measure your hop in meters.
Write the length as a decimal, like 0.85 meter.
Multiply to find how far 3 of those hops would reach.

Ribbit! Tomorrow is a Number Hunt for decimals.

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