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Multiplication
Division
Fractions
Decimals
Multiplication Strategies
100
13 x 4
What is 52
100
I am selling cookies for 3.50 each. how many will I have to sell to make 437.50
What is 125 cookies
100
2/10 + 3/5
What is 8/10 or 4/5
100
I have to make sure my decimals are ALWAYS lined up to find my sum or difference.
What is adding or subtracting decimals?
100
If one factor is 99, I find a nice number and multiply by the other factor then subtract or add the groups.
What is over or under strategy?
200
54 x 67
What is 3,618
200
98 ÷ 14
What is 7
200
4/5 - 1/2
What is 3/10
200
I can find my product by removing the decimals and then moving the decimal in my product however many digits are behind it.
What is multiplying decimals
200
Double one factor & halve the other until you get a friendly combination
What is Doubling and Halving
300
58 x 99
What is 5,742
300
How many groups of 19 go into 114?
What is 6 groups
300
2/5 x 4
What is 8/5 or 1 3/5
300
4.2-1.9
What is 2.3
300
Set up a table which you can build up to the number you want to multiply or divide by.
What is a ration table
400
448 x 25
What is 11,200
400
207 ÷ 9
What is 23
400
3/4 of 48 is ____, so 75 x 48 is ____.
What is 36 & 3,600
400
3.52 + 3.87
What is 7.39
400
Split up the algorithm into many different parts and then add up the parts to get the product
What is partial product or 4 partial product
500
387 x 72
What is 27,864
500
(50 x 10) ÷ 25
What is 20
500
1/4 of 64 is ____, so 25 x 64 is ____.
What is 16 & 1,600
500
8.3 x 5.8
What is 48.14
500
If one factor is 25 find 1/4 of the other factor and multiply by 100.
What is using quarters to multiply.