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Number Trail Grade 4 / Week 04 / Friday
5/6
Week 04 · Factors, multiples and patterns

Friday

Freddy's factor game
// Factor pairs, primes and number rules
⏱ about 15 min

Friday: Freddy's factor game

Freddy the Frog has painted numbers from 1 to 50 on smooth river stones.

"Ribbit! Welcome to Factor Falls," he says with a bow.

"Hop to a stone and tell me about its number."

"Is it prime or composite? What are its factor pairs?"

Samantha bounces from stone to stone, ready to play.

Bennie settles on the bank with his basket of apples.

"Take your time," he says. "Check each pair by multiplying."

Game 1: Factor pairs

FIND THE FACTORS
  • Read the question.
  • Tap your answer.
Which is a factor pair of 48?
Which is a factor pair of 30?
Which list shows all the factors of 18?
How many factors does 36 have?

Game 2: Multiples

MULTIPLE OR NOT?
  • Read the question.
  • Tap your answer.
Is 56 a multiple of 7?
Is 39 a multiple of 4?
What is the next multiple of 6 after 48?
Which number is a multiple of 8?

Game 3: Prime or composite

SORT THE STONES
  • Read the question.
  • Tap your answer.
Is 31 prime or composite?
Is 27 prime or composite?
Which number is prime?
Which number is composite?

Game 4: Patterns

FOLLOW THE RULE
  • Read the question.
  • Tap your answer.
Rule: add 6. Start at 4. What is number 5 in the pattern?
1, 3, 5, 7, 9, ... What comes next?
2, 6, 18, 54, ... What comes next?
ORDER FROM LEAST TO GREATEST
  • Work out each number.
  • Tap them from least to greatest.
11st
22nd
33rd
44th
SentenceTrue or false?
6 × 8 is a factor pair of 48.?
39 is a multiple of 4.?
31 is a prime number.?
27 is a prime number.?
WHY THIS EXERCISE27 = 3 × 9, so 27 is composite. 39 ÷ 4 leaves a remainder of 3.
Try it
Hop like Freddy, counting by threes: 3, 6, 9.
Keep hopping until you reach 30.
Every number you said is a multiple of 3.
◇ FACTOR DETECTIVE
One of you thinks of a number from 2 to 50.
The other asks yes or no questions, like is 5 a factor?
Guess the number in as few questions as you can.
Then say whether it is prime or composite.

Ribbit! Great game. Tomorrow is a Number Hunt.

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