Page 89 - Start Up Mathematics_1

Remember

• A number just before any number is one less than it.
For example, 12 is before 13 (12 = 13 – 1)

• A number just after any number is one more than it.
For example, 16 is after 15 (16 = 15 + 1)

• A number between two numbers is in their middle.
For example, 19 is between 18 and 20 (18 19 20)

12 Colour the box with the correct answer.

(a) 11 is before 12 10 9

(b) 13 is after 12 14 11

(c) 18 is before 17 16 19

(d) 15 is after 14 16 13

(e) 19 is before 18 20 17

13 Write the number that comes before, after or in between.

(a) 17 (b) 14 (c) 11 13

(d) 10 (e) 18 (f) 18 20

14 Fill in the boxes.

(a) 10 12

(b) 13 15 17

(c) 17 19

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