Download Multiplication Facts Parent Pipeline

Grade 4 Unit 3 – Multiplication Facts Parent Pipeline
Outcome N4: Explain the properties of 0 and 1 for multiplication and the property of 1 for division.
Outcome N5: Describe and apply mental math strategies such as:

skip counting from a known fact

using doubling or halving

using doubling or halving and adding or subtracting one more group

using patterns in the 9s facts to determine basic multiplication facts to 9 x9 and related division facts.
For these outcomes, students are required to think about strategies that can help them solve
basic multiplication facts so that they can answer them quickly and efficiently. By the end of grade 4,
students will be required to answer 15 mixed multiplication and division facts in 2 minutes. They also
will be required to know their basic facts for unit 8, which deals with multiplication and division of larger
numbers. Therefore, these strategies are extremely important for students to understand.
Students can read
multiplication sentences
like 2 x 3 as ‘2 groups of 3.’
2x3=6
factors
product
Multiplying by One
Students should understand then when you multiply by 1, the answer is always the other factor.
5x1=5
1x8=8
Multiplying by 0
Students should understand that when you multiply by 0, the answer is always 0! 5 groups of 0 is still 0!
7x0=0
0x9=0
Doubles for Multiplying by 2
When students are multiplying by 2, they can just double the other factor!
Problem
My Strategy
Answer
double 3
2x3
6
7x2
7+7
14
Doubles for Multiplying by 4
Using doubles can also help when multiplying by 4. Just think “Double Double!” Whenever one factor
doubles, your product also doubles.
Problem
My Strategy
Answer
double 6 = 12
24
4x6
double 12 = 24
3x4
3x2=6
3 x 4 = 12
12
*the product for 3 x 2 is 6, so when I double one
factor (2 doubled is 4) the product doubles (6
doubled is 12)
Doubles Plus One More Group when Multiplying by 3
Sometimes when multiplying, we can think of our doubles plus another group.
Problem
My Strategy
Answer
2 x 6 = 12 + 6 = 18
3x6
18
7 x 2 = 14 plus one more group
7x3
of 7 = 21
21
Using x5 and x2 When Multiplying by 7
Students can break one factor apart and multiply both parts by the other factor. The answer will still be
the same.
Problem
My Strategy
Answer
7x6
7x6
5 x 6 = 30
42
(5 + 2) x 6 2 x 6 = 12
8x7
8 x 5 = 40
8 x 2 = 16
56
Strategies for Multiplying by 8
When multiplying numbers by 8, students can think “Double, double, double!” They double the other factor three
times. They may also break the 8 into 5 + 3 and multiply each part by the other factor, adding both products
together at the end.
Problem
Answer
8x7
My Strategy
8x7
5 x 7 = 35
(5 + 3) x 7 3 x 7 = 21
3x8
3 x 2 = 6 x 2 – 12 x 2 = 24
24
56
Strategies for Multiplying by 9
Students can think of multiplying by 10, and then subtracting one group when multiplying by 9. Also, the
2 digits in the product, always add up to 9. For example, 2 x 9 = 18, and 1 + 8 is 9.
Problem
My Strategy
Answer
10 x 7 = 70
63
9x 7
70 – 7 = 63