Making 1000

Break up one thousand in different ways.

In your book, Maths Mela (Chapter 4), you break up one thousand. Picture 10 hundred-squares side by side: that is 1000. If you are at 900, how much more do you need to reach 1000? 900 is 9 hundreds, so you need 1 more hundred: 900 + 100 = 1000. In the same way, 800 + 200 = 1000.

When the number is not a whole hundred, go in two jumps. From 850, jump 50 to reach 900, then 100 to reach 1000. Together that is 50 + 100 = 150, so 850 + 150 = 1000. From 760, jump 40 to reach 800, then 200 to reach 1000: 760 + 240 = 1000.

We can also ask how much less a number is than 1000. 400 is 600 less than 1000, because 400 + 600 = 1000. We write 1000 − 600 = 400.

Even a number like 497 works. Jump 3 to reach 500, then 500 to reach 1000: 3 + 500 = 503. So 497 + 503 = 1000. Check any answer by adding: the two numbers must make exactly 1000.

To find how much more makes 1000, jump to the next hundred, then on to 1000, and add the jumps (760 + 240 = 1000).

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