Times Table Answers

100 x 1000 = 100000

100 times 1000 is 100,000, one hundred thousand. Both factors are powers of ten, so the zeros simply add: two plus three makes five, and a 1 with five zeros is 100,000.

100 × 1,000 = 100,000

Adding 100 to itself 1,000 times gives the same answer.

Add the zeros, not the numbers

100 is 10 x 10. 1000 is 10 x 10 x 10. Multiply them together and you are multiplying five tens, which is ten to the fifth power, written out as 100,000.

In exponent form 100 is ten squared and 1000 is ten cubed. Multiplying powers of the same base adds the exponents, so 2 plus 3 gives 5. This is the cleanest example of that rule you will meet, which is why it is worth doing once by hand.

Counting the zeros without losing one

100,000 has five zeros. One zero too many makes 1,000,000, a million, which is ten times too big. One too few makes 10,000. Say the answer aloud as “one hundred thousand” first, then write digits to match the words. The words are much harder to get wrong than a row of zeros.

What one hundred thousand is called

In the Indian numbering system 100,000 is one lakh, and it is written 1,00,000 because the digits are grouped differently after the first three. Same quantity, different way of splitting it up on the page.

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