Multiply in Columns
Grade 4 - Math - Building Confidence
Multiply 332 x 3 using the standard column algorithm.
To multiply 456 x 5, start with the ones digit: 6 x 5 = 30. What digit do you carry to the tens column?
Continuing 320 x 3: the tens digit is 2. What is 2 x 3?
When multiplying 4 x 7 = 28 in one column, why do you write down 8 and carry the 2 to the next column?
- Because 8 is the larger of the two digits in 28, so it moves to the next column.
- Because every two-digit product must be split evenly between two columns.
- Because 28 has 2 tens, which get added into the value of the next column.
- Because you always carry the ones digit and keep the tens digit in place.
Round 540 to the nearest hundred to estimate 540 x 6. What is the estimate?
Which pair of smaller multiplications also equals 281 x 4?
- 200 x 4, plus 81 x 4
- 200 x 4, plus 82 x 4
- 300 x 4, plus 81 x 4
- 200 x 5, plus 81 x 4
A shipping company loads 896 boxes onto each of 4 trucks. How many boxes is that in all?
A student multiplies 740 x 6 and gets 444. Is that reasonable?
- No, because 740 x 6 should be about 4,200, not 444.
- Yes, that product looks about right without checking an estimate.
- No, because a product must always be less than 740.
- No, because you should add 740 and 6 instead of multiplying.
In 528 x 3, the hundreds digit of 528 is 5. What is 5 x 3?
Multiply 384 x 3 using the standard column algorithm. Line up the digits by place value.