What is the difference between the numbers? Count backwards. What number comes next? Complete the table: Calculate the following:

here are the solutions to the math problems:

1. What number comes next?

• a. The pattern is adding $10 000$.

  $$90 000 + 10 000 = 100 000$$

  The next number is $\boxed{\textbf{100 000}}$.

• b. The pattern is adding $10 000$.

  $$56 548 + 10 000 = 66 548$$

  The next number is $\boxed{\textbf{66 548}}$.

• c. The pattern is adding $1 000$.

  $$51 900 + 1 000 = 52 900$$

  The next number is $\boxed{\textbf{52 900}}$.

• d. The pattern is adding $10 000$.

  $$69 999 + 10 000 = 79 999$$

  The next number is $\boxed{\textbf{79 999}}$.

2. Complete the table:

Number	Add 1 000	Subtract 1 000	Add 10 000	Subtract 10 000
19 564	20 564	18 564	29 564	9 564
23 487	24 487	22 487	33 487	13 487
44 201	45 201	43 201	54 201	34 201
56 020	57 020	55 020	66 020	46 020
70 009	71 009	69 009	80 009	60 009

3. Calculate the following:

• a.

  $$92 458 + 82 = 92 540$$

  The sum is $\boxed{\textbf{92 540}}$.

• b.

  $$78 341 + 798 = 79 139$$

  The sum is $\boxed{\textbf{79 139}}$.

• c.

  $$15 789 + 5 647 = 21 436$$

  The sum is $\boxed{\textbf{21 436}}$.

• d.

  $$32 153 + 20 477 = 52 630$$

  The sum is $\boxed{\textbf{52 630}}$.