Multiplication of Two-Digit by One-Digit Mixed with Word Problems and Standard Algorithm

How do you multiply using the standard algorithm?

• By adding repeatedly

• By using the lattice method

• By aligning numbers vertically and multiplying each digit

• By dividing the numbers

Answer explanation

The standard algorithm for multiplication involves aligning numbers vertically by their place values and multiplying each digit of the bottom number by each digit of the top number, then adding the results.

Which of the following describes the process of multiplying a decimal by a whole number?

• Align the decimal points and multiply as whole numbers, then place the decimal point in the product.

• Multiply the numbers ignoring the decimal, then count the total decimal places in the factors and place the decimal point in the product accordingly.

• Convert the decimal to a fraction and multiply by the whole number, then convert back to a decimal.

• Multiply the whole number by 10 and then divide the product by the decimal.

Answer explanation

To multiply a decimal by a whole number, ignore the decimal point, multiply as if they are whole numbers, then count the total decimal places in the original factors and place the decimal point in the product accordingly.

What is involved in 'Multiplying Multi-Digit Whole Numbers'?

• Addition and subtraction

• Only addition

• Multiplication and addition

• Multiplication and carrying over

Answer explanation

Multiplying multi-digit whole numbers involves using multiplication and carrying over when the product exceeds a single digit. This process ensures accurate results, making 'Multiplication and carrying over' the correct choice.

Using the standard algorithm, find the product of

61 x 6 =

Using the standard algorithm, find the product of 72 x 3 =

• 144

• 216

• 75

• 206

Using the standard algorithm, find the product of

51 x 4 =

Using the standard algorithm, find the product of

71 x 9 =

Using the standard algorithm, find the product of

21 x 6 =

• 120

• 112

• 116

• 126