Page 211 - ICSE Math 5

Progress Worksheet

Mental Maths

1. Look at the patterns carefully, identify the unit of repeat and extend them.

(a) ___________________

(b) ___________________

(c) ___________________

(d) ___________________

2. Complete the following patterns.

(a) _________ _________

(b) _________ _________

(c) _________ _________

3. Extend the following patterns by identifying the pattern rule.
(a) 3, 6, 12, 24, ______, ______, ______

(b) 10, 15, 20, 25, ______, ______, ______

(c) ______ ______ ______

(d) A 4 B 5 C 6 D 7 ______ ______ ______

4. Use the following codes to code the given messages.

A B C D E F G H I J K L M
26 25 24 23 22 21 20 19 18 17 16 15 14

N O P Q R S T U V W X Y Z
13 12 11 10 9 8 7 6 5 4 3 2 1

(a) I LOVE INDIA (b) KEEP DELHI CLEAN

5. Use the codes given in above question to decode the following messages.
(a) 14 26 7 19 8 18 8 21 6 13 (b) 16 22 22 11 8 14 18 15 18 13 20

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