Page 20 - Start Up Mathematics_1

Look at the number line.

155 is between
154 and 156
151 is before 152 159 is after 158

150 151 152 153 154 155 156 157 158 159 160

• 151 is before 152. It is called the Quick Tip
predecessor of 152. To find the
predecessor, we subtract 1 from a 151 –1 152
number (152 – 1 = 151).
Predecessor
• 159 is after 158. It is called the

successor of 158. To find the 158 +1 159
successor, we add 1 to a number
(158 + 1 = 159). Successor

• 155 is between 154 and 156.

11 Write the number that comes before the given number.

(a) 123 (b) 140 (c) 131

(d) 186 (e) 190 (f) 155

12 Write the number that comes after the given number.

(a) 179 (b) 111 (c) 120

(d) 198 (e) 152 (f) 149

(g) 166 (h) 185 (i) 197

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