Double Century

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The 10 symbols are: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. These symbols were created by ancient Indians and are now used everywhere in the world to write any number, however large.

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The symbol '0' means 'nothing' and it is what really made our number system work! Without 0, we couldn't write numbers like 10, 20, 100, 101, etc. It helps us show empty places in numbers.

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70 + 30 = 100. When we have 70, we need 30 more to make 100. This is called making number bonds to 100.

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100 + 5 = 105 (One hundred and five). When we add single digits to 100, we get numbers in the hundreds with that digit in the ones place.

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123. This has 1 in the hundreds place, 2 in the tens place, and 3 in the ones place. One hundred (100) + twenty (20) + three (3) = 123.

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110 (One hundred and ten). When we add 1 to 109, the ones place changes from 9 to 0, and the tens place increases from 0 to 1.

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15 bundles of 10 matchsticks. 150 = 15 tens + 0 ones. We can also think of it as 1 hundred (10 bundles) + 5 tens (5 bundles) + 0 ones.

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129. When we subtract 1 from 130, the ones place changes from 0 to 9, and the tens place decreases from 3 to 2.