1. The product of two odd numbers is 195.

What are they?

2. The difference between two square numbers is 21.

What are they?

3. The sum of three prime numbers is 31.

What are they?

4. The ratio of two even numbers is 11:6.

What are they?

## A Mathematics Lesson Starter Of The Day

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Topics: Starter | Arithmetic | Number | Puzzles | Ratio

• C. J. Southward, Limehouse Cumbria
•
• In the product question the solutions do not include the double negative
solutions.
• Transum,
•
• Thanks CJ. That has now been allowed for in the answers below.
• 6N, Charnwood Primary School
•
• We really enjoyed this and some of us thought it was easy - However we haven't tried the hard numbers yet!
• Transum,
•
• Click on one of the gold stars below and you will see a bar chart showing how people scored this starter. At the time of writing there were exactly the same number of votes for one as there were for five. This is probably because this starter requires a knowledge of some particular terms and concepts and some pupils will have this knowledge while others are too young to be expected to understand. Originally these starters were aimed at Secondary/High school pupils but they are commonly accessed by Primary school pupils, some only in Year 2!
If you are one of the teachers who scored this page a one, have a look at some of the other starters as there is probably something that will suit your class. There are 366 Starters Of The Day with some additional Advanced Starters being added this month.

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Excellent, I would like to see more like this
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Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 5.0 out of 5 based on 1 votes.

Previous Day | This starter is for 4 June | Next Day

1. 1 and 195 or 3 and 65 or 5 and 39 or 13 and 15 (and their negatives).

2. 4 and 25 or 100 and 121. Could there be any other solutions?

3. 3, 5 and 23 or 3, 11 and 17 or 5, 7 and 19 or 5, 13 and 13 or 7, 7 and 17 or 7, 11 and 13.

4. 22 and 12 or 44 and 24 or 66 and 36 or ...

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