Let’s go step by step through each number pattern. We’ll find the missing numbers and describe the pattern (like “add 20” or “subtract 15”).
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Pattern 1: 183, 203, ___, ___, ___, 283, 303
Look at the jump from 183 to 203 → that’s +20
Then 203 to next should be +20 → 223
Then 243, then 263
Check: 263 + 20 = 283 ✔️, 283 + 20 = 303 ✔️
→ Pattern:
Add 20
Missing:
223, 243, 263
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Pattern 2: ___, ___, 277, 287, 297, 307, 317
From 277 to 287 is +10
So going backward: 277 - 10 = 267, then 257
Check: 257, 267, 277... up to 317 — all +10
→ Pattern:
Add 10
Missing:
257, 267
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Pattern 3: 145, 160, ___, ___, ___, 220, 235
145 to 160 = +15
Next: 160 + 15 = 175
Then 190, then 205
Check: 205 + 15 = 220 ✔️, 220 + 15 = 235 ✔️
→ Pattern:
Add 15
Missing:
175, 190, 205
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Pattern 4: ___, ___, 307, 332, 357, 382, 407
Look at 307 to 332 = +25
332 to 357 = +25
So going back: 307 - 25 = 282, then 282 - 25 = 257
Check: 257, 282, 307... up to 407 — all +25
→ Pattern:
Add 25
Missing:
257, 282
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Pattern 5: 181, 221, ___, ___, ___, 381, 421
181 to 221 = +40
Next: 221 + 40 = 261
Then 301, then 341
Check: 341 + 40 = 381 ✔️, 381 + 40 = 421 ✔️
→ Pattern:
Add 40
Missing:
261, 301, 341
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Pattern 6: ___, ___, 280, 295, 310, 325, 340
280 to 295 = +15
Backward: 280 - 15 = 265, then 265 - 15 = 250
Check: 250, 265, 280... up to 340 — all +15
→ Pattern:
Add 15
Missing:
250, 265
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Pattern 7: 222, 242, ___, ___, ___, 322, 342
222 to 242 = +20
Next: 242 + 20 = 262
Then 282, then 302
Check: 302 + 20 = 322 ✔️, 322 + 20 = 342 ✔️
→ Pattern:
Add 20
Missing:
262, 282, 302
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Pattern 8: ___, ___, 312, 342, 372, 402, 432
312 to 342 = +30
Backward: 312 - 30 = 282, then 282 - 30 = 252
Check: 252, 282, 312... up to 432 — all +30
→ Pattern:
Add 30
Missing:
252, 282
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Pattern 9: 123, 173, ___, ___, ___, 373, 423
123 to 173 = +50
Next: 173 + 50 = 223
Then 273, then 323
Check: 323 + 50 = 373 ✔️, 373 + 50 = 423 ✔️
→ Pattern:
Add 50
Missing:
223, 273, 323
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Pattern 10: ___, ___, 400, 475, 550, 625, 700
400 to 475 = +75
Backward: 400 - 75 = 325, then 325 - 75 = 250
Check: 250, 325, 400... up to 700 — all +75
→ Pattern:
Add 75
Missing:
250, 325
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Pattern 11: 180, 240, ___, ___, ___, 480, 540
180 to 240 = +60
Next: 240 + 60 = 300
Then 360, then 420
Check: 420 + 60 = 480 ✔️, 480 + 60 = 540 ✔️
→ Pattern:
Add 60
Missing:
300, 360, 420
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Pattern 12: ___, ___, 265, 320, 375, 430, 485
265 to 320 = +55
Backward: 265 - 55 = 210, then 210 - 55 = 155
Check: 155, 210, 265... up to 485 — all +55
→ Pattern:
Add 55
Missing:
155, 210
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Final Answer:
1. 223, 243, 263 — Add 20
2. 257, 267 — Add 10
3. 175, 190, 205 — Add 15
4. 257, 282 — Add 25
5. 261, 301, 341 — Add 40
6. 250, 265 — Add 15
7. 262, 282, 302 — Add 20
8. 252, 282 — Add 30
9. 223, 273, 323 — Add 50
10. 250, 325 — Add 75
11. 300, 360, 420 — Add 60
12. 155, 210 — Add 55
Parent Tip: Review the logic above to help your child master the concept of pattern rule worksheet grade 3.
