1.8 Exercise supplement

$\begin{array}{c}\hfill 908\\ \hfill \underline{+\mathrm{ 29}}\end{array}$

$\begin{array}{c}\hfill 529\\ \hfill \underline{+161}\end{array}$

$\begin{array}{c}\hfill 549\\ \hfill \underline{+\mathrm{ 16}}\end{array}$

$\begin{array}{c}\hfill 726\\ \hfill \underline{+892}\end{array}$

$\begin{array}{c}\hfill 390\\ \hfill \underline{+169}\end{array}$

$\begin{array}{c}\hfill 166\\ \hfill \underline{+660}\end{array}$

$\begin{array}{c}\hfill 391\\ \hfill \underline{+951}\end{array}$

$\begin{array}{c}\hfill 48\\ \hfill \underline{+36}\end{array}$

$\begin{array}{c}\hfill \mathrm{1,103}\\ \hfill \underline{+\mathrm{ 898}}\end{array}$

$\begin{array}{c}\hfill \mathrm{1,642}\\ \hfill \underline{+\mathrm{ 899}}\end{array}$

$\begin{array}{c}\hfill 807\\ \hfill \underline{+\mathrm{1,156}}\end{array}$

$\begin{array}{c}\hfill \mathrm{80,349}\\ \hfill \underline{+\mathrm{ 2,679}}\end{array}$

$\begin{array}{c}\hfill \mathrm{70,070}\\ \hfill \underline{+\mathrm{ 9,386}}\end{array}$

$\begin{array}{c}\hfill \mathrm{90,874}\\ \hfill \underline{+\mathrm{ 2,945}}\end{array}$

$\begin{array}{c}\hfill \mathrm{45,292}\\ \hfill \underline{+\mathrm{51,661}}\end{array}$

$\begin{array}{c}\hfill \mathrm{1,617}\\ \hfill \underline{+\mathrm{54,923}}\end{array}$

$\begin{array}{c}\hfill \mathrm{702,607}\\ \hfill \underline{+\mathrm{ 89,217}}\end{array}$

$\begin{array}{c}\hfill \mathrm{6,670,006}\\ \hfill \underline{+\mathrm{ 2,495}}\end{array}$

$\begin{array}{c}\hfill 267\\ \hfill \underline{+\mathrm{8,034}}\end{array}$

$\begin{array}{c}\hfill \mathrm{7,007}\\ \hfill \underline{+\mathrm{11,938}}\end{array}$

$\begin{array}{c}\hfill \mathrm{131,294}\\ \hfill \underline{+\mathrm{ 9,087}}\end{array}$

$\begin{array}{c}\hfill \mathrm{5,292}\\ \hfill \underline{+\mathrm{ 161}}\end{array}$

$\begin{array}{c}\hfill \mathrm{17,260}\\ \hfill \underline{+\mathrm{58,964}}\end{array}$

$\begin{array}{c}\hfill \mathrm{7,006}\\ \hfill \underline{-\mathrm{5,382}}\end{array}$

$\begin{array}{c}\hfill \mathrm{7,973}\\ \hfill \underline{-\mathrm{3,018}}\end{array}$

$\begin{array}{c}\hfill \mathrm{16,608}\\ \hfill \underline{-\mathrm{ 1,660}}\end{array}$

$\begin{array}{c}\hfill \mathrm{209,527}\\ \hfill \underline{-\mathrm{ 23,916}}\end{array}$

$\begin{array}{c}\hfill 584\\ \hfill \underline{-226}\end{array}$

$\begin{array}{c}\hfill \mathrm{3,313}\\ \hfill \underline{-\mathrm{1,075}}\end{array}$

$\begin{array}{c}\hfill 458\\ \hfill \underline{-122}\end{array}$

$\begin{array}{c}\hfill \mathrm{1,007}\\ \hfill \underline{+\mathrm{ 331}}\end{array}$

$\begin{array}{c}\hfill \mathrm{16,082}\\ \hfill \underline{+\mathrm{ 2,013}}\end{array}$

$\begin{array}{c}\hfill 926\\ \hfill \underline{-\mathrm{ 48}}\end{array}$

$\begin{array}{c}\hfill 736\\ \hfill \underline{+\mathrm{5,869}}\end{array}$

$\begin{array}{c}\hfill \mathrm{676,504}\\ \hfill \underline{-\mathrm{ 58,277}}\end{array}$

$\begin{array}{c}\hfill 769\\ \hfill 795\\ \hfill 298\\ \hfill \underline{\mathrm{ 746}}\end{array}$

$\begin{array}{c}\hfill 554\\ \hfill 184\\ \hfill \underline{\mathrm{ 883}}\end{array}$

$\begin{array}{c}\hfill \mathrm{30,188}\\ \hfill \mathrm{79,731}\\ \hfill \mathrm{16,600}\\ \hfill \mathrm{66,085}\\ \hfill \mathrm{39,169}\\ \hfill \underline{\mathrm{ 95,170}}\end{array}$

$\begin{array}{c}\hfill \mathrm{2,129}\\ \hfill \mathrm{6,190}\\ \hfill \mathrm{17,044}\\ \hfill \mathrm{30,447}\\ \hfill 292\\ \hfill 41\\ \hfill \underline{\mathrm{ 428,458}}\end{array}$

$\mathrm{2,}\text{957}+\mathrm{9,}\text{006}$

$\text{19},\text{040}+\text{813}$

$\text{350},\text{212}+\text{14},\text{533}$

$\text{970}+\text{702}+\text{22}+8$

$\mathrm{3,}\text{704}+\mathrm{2,}\text{344}+\text{429}+\text{10},\text{374}+\text{74}$

$\text{874}+\text{845}+\text{295}-\text{900}$

$\text{904}+\text{910}-\text{881}$

$\text{521}+\text{453}-\text{334}+\text{600}$

$\text{892}-\text{820}-9$

$\text{159}+\mathrm{4,}\text{085}-\text{918}-\text{608}$

$\mathrm{2,}\text{562}+\mathrm{8,}\text{754}-\text{393}-\text{385}-\text{910}$

Subtract 671 from 8,027.

Subtract 387 from 6,342.

Subtract 2,926 from 6,341.

Subtract 4,355 from the sum of 74 and 7,319.

Subtract 325 from the sum of 7,188 and 4,964.

Subtract 496 from the difference of 60,321 and 99.

Subtract 20,663 from the difference of 523,150 and 95,225.

Add the difference of 843 and 139 to the differ­ence of 4,450 and 839.

Add the difference of 997,468 and 292,513 to the difference of 22,140 and 8,617.

Subtract the difference of 8,412 and 576 from the sum of 22,140 and 8,617.

Add the sum of 2,273, 3,304, 847, and 16 to the difference of 4,365 and 864.

Add the sum of 19,161, 201, 166,127, and 44 to the difference of the sums of 161, 2,455, and 85, and 21, 26, 48, and 187.

Is the sum of 626 and 1,242 the same as the sum of 1,242 and 626? Justify your claim.