**What are four digit numbers?**

We can divide 4-digit numbers into 9 groups.

(I) **1000 to 1999** (one thousand to one thousand nine hundred ninety-nine)

(ii) **2000 to 2999** (two thousand to two thousand nine hundred ninety-nine)

(iii) **3000 to 3999** (three thousand to three thousand nine hundred ninety-nine)

(iv) **4000 to 4999** (four thousand to four thousand nine hundred ninety-nine)

(v) **5000 to 5999** (five thousand to five thousand nine hundred ninety-nine)

(vi) **6000 to 6999** (six thousand to six thousand nine hundred ninety-nine)

(vii) **7000 to 7999** (seven thousand to seven thousand nine hundred ninety-nine)

(viii) **8000 to 8999** (eight thousand to eight thousand nine hundred ninety-nine)

(ix) **9000 to 9999** (nine thousand to nine thousand nine hundred ninety-nine)

**Note: **Four-digit numbers start with 1000.

If all digits of a digit, then two digits and then three digits are step by step to the right of a thousand according to their local values, the numbers from 1001 to 1999 are formed.

1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011, 1012, 1013, 1014, 1015, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023, 1024, 1025, 1026, 1027, 1028, 1029, 1030, 1031, 1032, 1033, 1034, 1035, 1036, 1037, 1038, 1039, 1040, 1041, 1042, 1043, 10144, 1045, 1046, 1047, 1048, 1049, 1050, 1051, 1052, 1053, 1054, 1055, 1056, 1057, 1058, 1059, 1060, 1061, 1062, 1063, 1064, 1065, 1066, 1067, 1068, 1069, 1070, 1071, 1072, 1073, 1074; 1075, 1076, 1077, 1078, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086, 1087, 1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099, 1110, 1111, …………………., 1199, 1200, …………………., 1299, 1300, 1301, ………………………., 1399, 1400, ……… …………, 1499, 1500, 1501, …………………., 1899, 1900, 1901, ………………… .., 1921, …………………., 1971,… ………………., 1981, ………………………, 1991, …………………., 1999. Likewise 2000, …………… .., 2199, …… …… ……… .., 2299, ……………………, 2799, ……………………, 2899, ………………… .., 2999 are formed. So we reach up to 3999, ……………… .., 4999, …………………, 5999, …………………, 6999, …………………, 7999, …… ……………, 8999, ………………… .., 9999.

**Below are some four-digit numbers on the abacus:**

2354
Two thousand three hundred fifty-four |
5241
Five thousand two hundred forty-one |

Mike has 999 lollipops. He made 9 packets of 100 lollipops each. He now has 99 lollipops. How many more lollipops does Mike need to make another packet of 100 lollipops?

**99 + 1 = 100**

With 1 more lollipop, Mike can make another packet of 100 lollipops.

Mike now has 10 packets of 100 lollipops each.

10 hundreds = 1 thousand = 1000 So Mike has a total of 1000 lollipops. 1000 is a 4-digit number and is read as “one thousand”. |
1 packet = 100 lollipops 2 packages = 100 + 100 = 200 lollipops 3 packages = 200 + 100 = 300 lollipops 4 packages = 300 + 100 = 400 lollipops 5 packages = 400 + 100 = 500 lollipops 6 packages = 500 + 100 = 600 lollipops 7 packages = 600 + 100 = 700 lollipops 8 packets = 700 + 100 = 800 lollipops 9 packages = 800 + 100 = 900 lollipops |

1000 is the smallest 4-digit number. 9999 is the largest 4-digit number.

One digit Binary Three digits Four digits |
9 99 999 9999 |
0 10 100 1000 |

9 + 1 = 10

99 + 1 = 100

999 + 1 = 1000

Now let’s learn some 4 digit number names.

**Note:** 1. The largest 4-digit number is 9999.

2. The smallest 4-digit number is 1000.

**3rd grade math lesson**

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