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This challenge is about finding the difference between numbers which have the same tens digit.

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If you count from 1 to 20 and clap more loudly on the numbers in the two times table, as well as saying those numbers loudly, which numbers will be loud?

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Can you each work out the number on your card? What do you notice? How could you sort the cards?

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You can make a calculator count for you by any number you choose. You can count by ones to reach 24. You can count by twos to reach 24. What else can you count by to reach 24?

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This is a game in which your counters move in a spiral round the snail's shell. It is about understanding tens and units.

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Daisy and Akram were making number patterns. Daisy was using beads that looked like flowers and Akram was using cube bricks. First they were counting in twos.

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Find the squares that Froggie skips onto to get to the pumpkin patch. She starts on 3 and finishes on 30, but she lands only on a square that has a number 3 more than the square she skips from.

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You have a set of the digits from 0 â€“ 9. Can you arrange these in the five boxes to make two-digit numbers as close to the targets as possible?

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Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?

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Can you find 2 butterflies to go on each flower so that the numbers on each pair of butterflies adds to the same number as the one on the flower?

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Can you work out how to make each side of this balance equally balanced? You can put more than one weight on a hook.

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How would you create the largest possible two-digit even number from the digit I've given you and one of your choice?

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On Friday the magic plant was only 2 centimetres tall. Every day it doubled its height. How tall was it on Monday?

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I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.

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These pictures show squares split into halves. Can you find other ways?

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Annie and Ben are playing a game with a calculator. What was Annie's secret number?

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25 students are queuing in a straight line. How many are there between Julia and Jenny?

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Arrange any number of counters from these 18 on the grid to make a rectangle. What numbers of counters make rectangles? How many different rectangles can you make with each number of counters?

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In Sam and Jill's garden there are two sorts of bugs with 7 spots or 4 spots. What numbers of total spots can you make?

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Kimie and Sebastian were making sticks from interlocking cubes and lining them up. Can they make their lines the same length? Can they make any other lines?

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Noah saw 12 legs walk by into the Ark. How many creatures did he see?

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These pieces of wallpaper need to be ordered from smallest to largest. Can you find a way to do it?

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Using the cards 2, 4, 6, 8, +, - and =, what number statements can you make?

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Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?

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An activity centred around observations of dots and how we visualise number arrangement patterns.

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Exploring the structure of a number square: how quickly can you put the number tiles in the right place on the grid?

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Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.

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How would you count the number of fingers in these pictures?

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Look at different ways of dividing things. What do they mean? How might you show them in a picture, with things, with numbers and symbols?

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This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?

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Use the interactivity to find out how many quarter turns the man must rotate through to look like each of the pictures.

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Use your mouse to move the red and green parts of this disc. Can you make images which show the turnings described?

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Sara and Will were sorting some pictures of shapes on cards. "I'll collect the circles," said Sara. "I'll take the red ones," answered Will. Can you see any cards they would both want?

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Look at some of the patterns in the Olympic Opening ceremonies and see what shapes you can spot.

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Explore ways of colouring this set of triangles. Can you make symmetrical patterns?

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How many balls of modelling clay and how many straws does it take to make these skeleton shapes?

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Here are shadows of some 3D shapes. What shapes could have made them?

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Can you make five differently sized squares from the interactive tangram pieces?

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In this activity focusing on capacity, you will need a collection of different jars and bottles.

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Can you put these shapes in order of size? Start with the smallest.

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Try this matching game which will help you recognise different ways of saying the same time interval.

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The Man is much smaller than us. Can you use the picture of him next to a mug to estimate his height and how much tea he drinks?

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Describe what Emma might be doing from these pictures of clocks which show important times in her day.

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Try some throwing activities and see whether you can throw something as far as the Olympic hammer or discus throwers.

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Some children have been doing different tasks. Can you see who was the winner?

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Kimie and Sebastian were making sticks from interlocking cubes and lining them up. Can they make their lines the same length? Can they make any other lines?

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There were chews for 2 cents, mini eggs for 3 cents, Chocko bars for 5 cents and lollypops for 7 cents in the sweet shop. What could each of the children buy with their money?

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You'll need to work in a group on this problem. Use your sticky notes to show the answer to questions such as 'how many girls are there in your group?'.