challenge
6,000+3,000+12,000
21,000
900-678
222
900+368
1,268
697-456
241
400+100
500
900,000-400,000
500,000
17,523-11,140
6,383
4,989+1,296
6,285
897-569
328
600+500
1,100
2/6+2/3+0.5
1 1/2=1.5
24,914-14,186
10,728
2,789+5,370
8,159
793-579
1,372
984+379
1,363
(900,000+700,000)-800,000
800,000
12,000-5,973
9,738+5,743
15,481
908-689
219
400+978
1,378
(9,276+4,562)-6,973
6,865
19,000-7,957
12,043
3,568+8,927
12,495
900-367
533
597+979
1,576