B18 — Multiplication within 100: Automatizing Basic Facts Using the Ratio Table
Problem Strings for Fluency and Beyond · Multiplication within 100: Automatizing Basic Facts Using the Ratio Table
Teacher notes
This string is like B12.
The underlying strategy within the problems in this string is the distributive property. The value of the second problem is double the value of the first problem. The third problem can be thought of as 2 groups of 7 and 4 groups of 7 (the sum value of the first 2 problems.). 9 groups of 7 can be thought of as 10 groups of 7, less one group of 7. As you proceed through the string, allow time and pair talk when needed for students to examine the numbers and the relationships in the products to find helpful partial products for use when finding other products.
The string
- 2 x 7
- 4 x 7
- 6 x 7
- 10 x 7
- 9 x 7
- 12 x 7
- 8 x 7
