# Multiplying Two-Digit Numbers (Elementary)

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) product.

### Hint

What does the number on the left represent?  What does the number on the right represent?

96 · 87 is one answer for the largest product.  13 · 24 is the smallest product.

Source: Robert Kaplinsky

## Comparing Fractions

Directions: Using the numbers 1-9, each one time only, fill in the blanks to make …

1. Here is a Desmos visual that might support the task.

https://www.desmos.com/calculator/44rd3rwkpk

• Robert Kaplinsky

Nice Rusty! Too bad there isn’t a built in way to restrict duplicate numbers. Two thoughts:
– I wonder if there is a difference between a horizontal and vertical representation?
– Is there value in restricting a and b to 12 to 98? (11 or less and 99 and 100 are not possible)

12+12+12+12+12= 60
24 24 12=60
24+24+12=60
48+12=60

3. 24×13=212

87×96=1152

4. 12*34=38 and 10*25=25

5. 96×87 is the biggest.

6. 14×23=322

7. michael TROTTER

18 times 28=2204

8. 32*34=1,088

9. 96 x 87=8,282

10. 97×86 biggest
13×24 smallest

11. 98 x 76 largest
13*24

12. smallest is 13 x 24