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Arrays!
Expanded Algorithm
Standard Algorithm
Reasonableness
3 and 4-digit nummbers
100
Draw an array for 18 X 4
What is 72
100
17 X 9, what are the partial products?
What is 90, 36
100
Find the Product 13 X 3
What is 39
100
Round 19 X 4
What is 80
100
352 X 3
What is 1,056
200
Draw an array for 11 X 2
What is 22
200
Partial Products for 75 X 6
What is 30, 420
200
Find the Product 17 X 7
What is 119
200
29 X 8
What is 240
200
2,768 X 7
What is 19,376
300
Draw an array for 14 X 3
What is 42
300
Partial Products for 19 X 8
What is 72, 80
300
Find the product 24 X 5
What is 120
300
53 X 7
What is 350
300
3,521 X 4
What is 14,084
400
Draw an array for 16 X 3
What is 48
400
Partial Products for 28 X 7
What is 56, 140
400
Find the product 88 X 5
What is 440
400
48 X 5
What is 250
400
632 X 5
What is 3,160
500
Draw an array for 12 X 5
What is 60
500
Partial Products for 93 X 4
What is 12, 360
500
Find the product 52 X 8
What is 416
500
94 X 4
What is 360
500
1,848 X 9
What is 16,632