Number lines
2, ____, 22, 32, ____, 52, ____, _____
2, 12, 22, 32, 42, 52, 62, 72
102, ____, 82, _____, _____, 52, _____, 32
102, 92, 82, 72, 62, 52, 42, 32
9, ____, ____, 39, ____, 59, _____, _____
9, 19, 29, 39, 49, 59, 69, 79
46, ____, 66, ____, ____, 96, ____, ____
46, 56, 66, 76,86, 96, 106, 116
84, ____, 64, ____, ____, 34, _____, 14, _____
84, 74, 64, 54, 44, 34, 24, 14, 4
97, ____, 77, 67, ____, ____, 37, ____, ____
97, 87, 77, 67, 57, 47, 37, 27, 17
50 - 20 = ____
40 + 40 = ____