Topic 4: 2x2 Digit Multiplication

Front

What is the product of 80 and 50? How many zeros are in the product?

Back

The product of 80 and 50 is 4,000, which has 3 zeros.

Front

What are partial products in multiplication?

Back

Partial products are the results of multiplying each digit of one number by each digit of another number, before adding them together to get the final product.

Front

Calculate the partial products for 12 x 31.

Back

The four partial products are 300 (10 x 30), 60 (10 x 1), 10 (2 x 30), and 2 (2 x 1).

Front

If Regina makes 54 picture frames each week, how many frames does she make in 20 weeks?

Back

Regina makes 1,080 frames in 20 weeks (54 x 20 = 1,080).

Front

What is the product of 36 and 29?

Back

The product of 36 and 29 is 1,044.

Front

How do you estimate the product of two numbers?

Back

To estimate the product, round each number to the nearest ten or hundred and then multiply the rounded numbers.

Front

Estimate the product of 97 and 42.

Back

The estimated product of 97 and 42 is approximately 4,000 (100 x 40).

Front

What is the significance of zeros in multiplication?

Back

Zeros in multiplication indicate the scale of the product; more zeros typically mean a larger product.

Front

What is the standard algorithm for multiplying two-digit numbers?

Back

The standard algorithm involves multiplying each digit of the first number by each digit of the second number, adding the partial products, and aligning them according to place value.

Front

What is the difference between exact and estimated products?

Back

Exact products are the precise results of multiplication, while estimated products are approximations used for quick calculations.