Page 37 - NUMINO TG_5A
P. 37
Activity 1 Finding Factors
jOb ective Find factors in multiplication problems.
1. Textbook Instructions Activity 1 Finding Factors
1. Have the students choose two number 1 . 2 cards are chosen among number cards. Make 2 possible 2-digit
cards to make two different numbers and
then have them find the factors for the numbers using the cards. Then find the factors of the 2-digit
numbers made. numbers you made.
The number cards 2 and 1 can be used to Show 12 as a multiplication of Show 21 as a multiplication of
make 12 and 21. 2 numbers. 2 numbers.
Write multiplication sentences to find the
factors for 12 and 21. 12 = 1 12 21 = 1 21
Count the number of factors. 12 = 2 6 12 = 3 7
12 = 3 4
Remind the students to use the divisible rule So, there are 4 factors of 21:
to complete the activity. For example, since 1, 3, 7, 21
the ones place of 12 is even, it is divisible by
2. Also, since the sum of 1 and 2 is 3, the Number of factors: 4
number can also be divisible by 3.
So, there are 6 factors of 12:
1, 2, 3, 4, 6, 12
Number of factors: 6
12
2. Build Understanding
Problem: A teacher is trying to hand out 42 candies among his students. Write the solution and answer for
all of the ways the candies can be handed out evenly.
Solution: In order to find out how to hand out the 42 candies equally, the factors for 42 must be found.
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
There are 8 ways the candies can be handed out.
020 NUMINO Teacher s Guide
jOb ective Find factors in multiplication problems.
1. Textbook Instructions Activity 1 Finding Factors
1. Have the students choose two number 1 . 2 cards are chosen among number cards. Make 2 possible 2-digit
cards to make two different numbers and
then have them find the factors for the numbers using the cards. Then find the factors of the 2-digit
numbers made. numbers you made.
The number cards 2 and 1 can be used to Show 12 as a multiplication of Show 21 as a multiplication of
make 12 and 21. 2 numbers. 2 numbers.
Write multiplication sentences to find the
factors for 12 and 21. 12 = 1 12 21 = 1 21
Count the number of factors. 12 = 2 6 12 = 3 7
12 = 3 4
Remind the students to use the divisible rule So, there are 4 factors of 21:
to complete the activity. For example, since 1, 3, 7, 21
the ones place of 12 is even, it is divisible by
2. Also, since the sum of 1 and 2 is 3, the Number of factors: 4
number can also be divisible by 3.
So, there are 6 factors of 12:
1, 2, 3, 4, 6, 12
Number of factors: 6
12
2. Build Understanding
Problem: A teacher is trying to hand out 42 candies among his students. Write the solution and answer for
all of the ways the candies can be handed out evenly.
Solution: In order to find out how to hand out the 42 candies equally, the factors for 42 must be found.
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
There are 8 ways the candies can be handed out.
020 NUMINO Teacher s Guide
