Mastering UIL Number Sense Multiplication Short-cuts

What is the first step in the Backwards FOIL method?

• Multiply the first digits

• Subtract the differences

• Multiply the last digits

• Add the inner and outer products

In the example 31 * 21, what is the result of the inner and outer products added together?

• 3

• 4

• 5

• 6

When multiplying 42 * 31 using the Backwards FOIL method, what do you do after adding the inner and outer products?

• Subtract the differences

• Multiply the last digits

• Add the first digits

• Multiply the first digits and add the carried number

In the example 68 * 35, what is the sum of the inner and outer products?

• 58

• 60

• 54

• 50

What is the final result of 68 * 35 using the Backwards FOIL method?

• 2380

• 2310

• 2385

• 2340

How do you find the first two digits when multiplying numbers close to 100?

• Multiply the differences

• Divide the differences

• Subtract the differences from 100

• Add the differences to 100

In the example 96 * 97, what is the product of the differences?

• 14

• 12

• 10

• 16

When multiplying 98 * 93, what is the first two digits of the result?

• 91

• 90

• 92

• 93

For numbers slightly above 100, what operation do you perform instead of subtracting?

• Adding

• Multiplying

• Squaring

• Dividing

What is the final result of 102 * 103 using the technique for numbers above 100?

• 10706

• 10506

• 10606

• 10406