3. Count forwards Read the numbers first to decide what the intervals a) $$ 2500 ; \square ; 2600 ; 2650 ; \square ; 2750 ; \square $$ b) $$ \square ; 9055 ; \square ; 9255 ; \square ; 9455 $$ c) $$ 1483 ; 1478 ; \square ; 1468 ; 1463 ; \square ; \square $$ d) $$ 1260 ; 1310 ; \square ; 1410 ; \square ; 1510 ; \square $$

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To fill in the blanks in each sequence, we need to identify the intervals between the numbers and then calculate the missing values accordingly.

### a) $$ 2500 ; \square ; 2600 ; 2650 ; \square ; 2750 ; \square $$

1. The interval from $$2500$$ to $$2600$$ is $$100$$.
2. The interval from $$2600$$ to $$2650$$ is $$50$$.
3. The interval from $$2650$$ to $$2750$$ is $$100$$.
4. The interval from $$2750$$ to the next blank is $$50$$.

Now we can fill in the blanks:
- The first blank after $$2500$$ is $$2500 + 100 = 2600$$.
- The second blank after $$2650$$ is $$2650 + 50 = 2700$$.
- The last blank after $$2750$$ is $$2750 + 100 = 2850$$.

So, the completed sequence is:
$$ 2500 ; 2550 ; 2600 ; 2650 ; 2700 ; 2750 ; 2850 $$

### b) $$ \square ; 9055 ; \square ; 9255 ; \square ; 9455 $$

1. The interval from $$9055$$ to $$9255$$ is $$200$$.
2. The interval from $$9255$$ to $$9455$$ is also $$200$$.

Now we can fill in the blanks:
- The first blank before $$9055$$ is $$9055 - 200 = 8855$$.
- The second blank after $$9055$$ is $$9055 + 200 = 9255$$.
- The last blank after $$9255$$ is $$9255 + 200 = 9455$$.

So, the completed sequence is:
$$ 8855 ; 9055 ; 9255 ; 9255 ; 9455 $$

### c) $$ 1483 ; 1478 ; \square ; 1468 ; 1463 ; \square ; \square $$

1. The interval from $$1483$$ to $$1478$$ is $$-5$$.
2. The interval from $$1478$$ to $$1468$$ is $$-10$$.
3. The interval from $$1468$$ to $$1463$$ is $$-5$$.

Now we can fill in the blanks:
- The first blank after $$1478$$ is $$1478 - 10 = 1468$$.
- The second blank after $$1463$$ is $$1463 - 10 = 1453$$.
- The last blank after $$1453$$ is $$1453 - 5 = 1448$$.

So, the completed sequence is:
$$ 1483 ; 1478 ; 1473 ; 1468 ; 1463 ; 1458 ; 1453 $$

### d) $$ 1260 ; 1310 ; \square ; 1410 ; \square ; 1510 ; \square $$

1. The interval from $$1260$$ to $$1310$$ is $$50$$.
2. The interval from $$1310$$ to $$1410$$ is $$100$$.
3. The interval from $$1410$$ to $$1510$$ is also $$100$$.

Now we can fill in the blanks:
- The first blank after $$1310$$ is $$1310 + 100 = 1410$$.
- The second blank after $$1410$$ is $$1410 + 100 = 1510$$.
- The last blank after $$1510$$ is $$1510 + 100 = 1610$$.

So, the completed sequence is:
$$ 1260 ; 1310 ; 1360 ; 1410 ; 1460 ; 1510 ; 1560 $$

### Summary of Completed Sequences:
a) $$ 2500 ; 2550 ; 2600 ; 2650 ; 2700 ; 2750 ; 2850 $$  
b) $$ 8855 ; 9055 ; 9255 ; 9255 ; 9455 $$  
c) $$ 1483 ; 1478 ; 1473 ; 1468 ; 1463 ; 1458 ; 1453 $$  
d) $$ 1260 ; 1310 ; 1360 ; 1410 ; 1460 ; 1510 ; 1560 $$
a) $$ 2500 ; 2550 ; 2600 ; 2650 ; 2700 ; 2750 ; 2850 $$ b) $$ 8855 ; 9055 ; 9255 ; 9255 ; 9455 $$ c) $$ 1483 ; 1478 ; 1473 ; 1468 ; 1463 ; 1458 ; 1453 $$ d) $$ 1260 ; 1310 ; 1360 ; 1410 ; 1460 ; 1510 ; 1560 $$

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