Maths puzzles
Maths puzzle: One to nine (2)
Our first ‘One to Nine’ puzzle proved to be very popular so here is another. Aimed at upper juniors, (9-11 yr old) there are a few points to consider when getting started with these puzzles.
Firstly, the rules of Bodmas do not apply; the sentence is calculated in the order shown.
Secondly, each digit can only be used once.
Thirdly, if looking at a sentence such as a x b – c = 51, a x b can only be a maximum of 60 as the largest number to subtract is 9.
Maths puzzle: One to nine (1)
Here is a tricky little puzzle which is aimed at Year 6 or upper juniors (9/11). Ideal for wet breaks!
Using just the digits 1 to 9 complete the number sentences, both across and down, so that they are all correct.
A good knowledge of tables is needed, together with the ability to add and subtract mentally.
The hardest part of this puzzle is getting started and the best approach is to use trial and improvement by picking one row or column which can only have a limited number of possibilities. This might well not be the first row across or column down.
Looking at this particular puzzle the first row is a x b – c = 34. Start by looking at combinations of numbers that when multiplied make more than 34 (but not more than 43 as the maximum to subtract is 9) and then see which number can be subtracted to leave 34.
Maths puzzle: Initial numbers answers
I bet you can’t wait to get the answers to those frustrating letters I put on the site last week. Well, here they are. Some are very simple, such as:
28 days in February or 1066 Battle of Hastings.
For the full answer list click on the link.
Maths puzzle: Initial Numbers
It’s the last day of term and snowing quite heavily here so it looks as if there is no school at all for many children. Teachers will not be getting their pressies or having their last afternoon parties!
Oh well, here is a little puzzle for you to contemplate over the Christmas period.
Each number has some initials next to it. Just work out what the initials mean as the numbers are the clue.
For example:
7 D in a W is 7 Days in a Week
Some are these are pretty tricky and a score of 12 is good. Get them all right and you are a superstar indeed.
Answers after Christmas.
Thanks for all your comments and fun this year.
Year 4 maths worksheet: multiplying by 10 and 100
Understanding what happens when you multiply a whole number by 10 is crucial to understanding maths at primary school and indeed with later maths. Children should have carried out lots of practical work with base 10 apparatus in school to show that:
when you multiply a whole number by 10 the digits move one place to the left.
Now this may give the appearance of ‘adding a nought’ as a zero is placed in the units. I know of many teachers and publishers who still use this expression, but it is extremely dangerous, especially when it comes to multiplying decimals by 10. (0.8 is not 0.80).
Multiplying by 100 is the same as multiplying by 10 and then multiplying by 10 again (10 x 10 = 100) so each digit will move two places to the left and zeros will need to be placed in the units and tens.
When you multiply a whole number by 100 the digits move two places to the left.
Multiplying by 10 and 100 (pg 1)
Tables worksheet: 4x, 5x, 8x and 10 x tables
A second in our series of tables worksheets covering the 4 times, 5 times, 8 times and 10 times tables. Remember to learn tables by saying them out loud, as well as timing answers using worksheets such as these.
Maths vocabulary puzzle: ordering and place value
Here is a little word search to help children recognise and use the vocabulary expected of them in Year 1 to do with ordering and place value.
The words are:
more, less, plus, double, altogether, subtract, take, minus, half, difference and equals.
This is quite a difficult set of terms for children of this age (5/6 years old).
All the words on the wordsearch are either straight across or straight down – no diagonals.
Maths wordsearch: ordering and place value for Year 1
Number wordsearch: two times table
Another free maths worksheet from mathsblog.co.uk
It’s a while since we had a number puzzle so here is one to do with the two times table. This should encourage children with writing answers in words to the two times table that they find within the wordsearch. Not quite as easy as it looks as words such as eighteen and twenty are quite tricky to spell.
Number word search: two times table
Christmas maths worksheet: tree adding
Well, Christmas is nearly upon us so I am going to have a few days break and just leave you with a tricky little Christmas maths puzzle. I will be back with loads more worksheets and maths ideas in the new year.
This puzzle looks quite easy but can cause a lot of problems. Probably suitable for older children, or even mums and dads! It asks to put the digits 1 to 9 in stars around a Christmas tree so that each side of four stars adds up to the same total.
There are a number of solutions, the one shown just an example.
Free maths worksheet: ordinal numbers wordsearch
Free maths worksheet from mathsblog.co.uk: ordinal numbers wordsearch
Whilst young children are not expected to know the term ‘ordinal numbers’ they are expected to know and understand terms such as first, second, third etc.
This is a simple wordsearch using these terms. All the words can be found either going across or down – there are no diagonals. It is good practice to help with reading and writing these words.
Free maths worksheets: wordsearch make 24
Hope you have all had a pleasant summer holiday, even if the weather has not been brilliant.
Here is a nice little starter for all those 10/11 year olds going back to school next week. Oh well, just think of all the peace and quiet at home during the day!
Free maths worksheet: Wordsearch make 24
Free maths worksheet: Number search – Make 12
Well, it is certainly getting towards the end of term so I think we can afford to spare some time with some simple number searches and games.
The square has numbers and the four rules signs. just search across, down or diagonally to find number sentences that make 12. They could be addition, subtraction, division or multiplication.
Free maths worksheet: Number search – Make 12
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