Rounding to 10s
17
20
101
100
1
0
23 + 45 =
20 + 50 = 70
34 - 28 =
30 - 30 = 0
24
20
250
300
999
1,000
33 + 4 =
30 + 0 = 30
8 - 4 =
10 - 0 = 10
86
90
549
500
6,568
7,000
67 + 98 =
70 + 100 = 170
58 - 35 =
60 - 40 =20
195
200
52
100
3,500
4,000
124 + 321 =
120 + 320 = 440
123 - 25 =
120 - 30 = 90
1,674
1,670
649.99999999999999999999999999999999999999
600
15,789
16,000
509 + 247 =
510 + 250 = 760
64 - 1 =
60 - 0 = 60