Multiplication & Division Flashcards

All 6 cards in this deck

What are the steps of long multiplication?

e.g. $74 \times 58$

1. Multiply by the units: $74 \times 8 = 592$
2. Multiply by the tens: $74 \times 50 = 3700$
3. Add the lines: $4292$

What are the steps to multiply two decimals?

e.g. $54.6 \times 4.3$

1. Ignore the decimal points: $546 \times 43 = 23478$
2. Count the decimal places in the question: $1 + 1 = 2$
3. Put the point in the answer: $234.78$

What are the steps to divide by a decimal?

e.g. $7.2 \div 0.4$

1. Multiply both numbers by 10 (or 100) to make the divisor a whole number: $72 \div 4$
2. Do the division: $18$

In short division of a decimal by a whole number, where does the decimal point go in the answer?

e.g. $9.36 \div 4$

Directly above the decimal point in the number being divided: $2.34$.

In a problem asking the greatest number of items that can be bought, what do you do with the remainder?

Ignore it — round down to the whole number.
e.g. $23 \div 4 = 5.75$, so 5 items

True or false? Multiplying a number always makes it bigger.

False. Multiplying by a number less than 1 makes it smaller, e.g. $8 \times 0.5 = 4$.