1. Find the missing numbers here. … … 1 1.7 2.7 4.4 … …
Mental methods
N3.1 Extension Starter
The rule for this sequence is ‘to get the next number, add the two previous numbers’
Find the missing numbers here.
… … … …
0.57 × 7 = 3.99
How can you use this to work out 1.57 × 7 and × 7?
Find at least three pairs of numbers which fit this expression.
… = …
Preamble
These three independent activities give pupils practice in performing mental calculations with decimals, and also revision of sequences. As is always the case, group discussion will allow pupils to learn from each other as well as giving them practice at explaining their work verbally.
Possible content
Mental methods of calculation.
Resources
None.
Solution/Notes
1.57  7 = (0.57  7) + 7 = =  7 = (0.57  7) + 70 = = 73.99
Any correct numbers fitting … = … + 5.9
(The difference between numbers will always be 4.2.)