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4 February, 20:45

What is the student error in the multiplication below?

Multiply the ones: 957 times 23 = 2871. Above the 9 in 957 is 1, above the 5 in 957 is 2.

Multiply the tens: 957 times 23 = 2871. 2871 + 1914 = blank. Above the 9 in 957 is 1, above the 5 in 957 is 1.

When multiplying the ones, the student did not carry over a ten to the next place in the first multiplication.

When multiplying the ones, the student should have calculated 3 times 2 plus 5 as 11 and placed a 1 in the tens place.

When multiplying the tens, the student did not use the 0 place holder for the ones place.

When multiplying the tens, the student should have calculated 2 times 1 plus 9 as 11 and used a 1 should in the hundreds place.

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  1. 4 February, 20:56
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    Question:

    Options

    1) When multiplying the ones, the student did not carry over a ten to the next place in the first multiplication.

    2) When multiplying the ones, the student should have calculated 3 times 2 plus 5 as 11 and placed a 1 in the tens place.

    3) When multiplying the tens, the student did not use the 0 place holder for the ones place.

    4) When multiplying the tens, the student should have calculated 2 times 1 plus 9 as 11 and used a 1 should in the hundreds place.

    Answer:

    The correct option is;

    4) When multiplying the tens, the student did not use the 0 place holder for the ones place

    Step-by-step explanation:

    Here we have when doing long multiplication, the student correctly multiplies the ones as 2871, however, before commencing multiplication of the tens, a 0 should be placed in the ones place of the result as a place holder such that the outcome of the multiplication of the tens should be;

    19140

    Hence, the correct result should be 2871 + 19140 = 22011

    The correct option is therefore, that "When multiplying the tens, the student did not use the 0 place holder for the ones place."
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