addition with 4 digits
1,000+1,000
2,000
2,000-1,000
1,000
11,000+22,000
33,000
50,000-40,000
10,000
608,000+209,000
817,000
2,000+2,564
4,564
4,500-3,400
1,100
45,900+32,800
78,700
30,050-10,010
20,040
910,000+200,000
1,110,000
3,400+4,607
8,007
5,324-2,453
2,871
56,780+34,560
91,340
40,867-20,912
19,955
503,200+601,511
1,104,711
4,506+3,506
8,012
3,402-2,760
642
57,797+39,795
97,592
78,792-61,805
16,987
905,499+810,511
1,716,010
7,088+9,888
16,976
9,870-6,456
3,414
91,467+10,398
101,865
99,769-49,880
49,980
999,458+987,619
1,987,077