Table of Contents
What does it mean to double a number?
To get a double of a number, we add the same number to itself. For example, double of 2 is 2 + 2 = 4.
What is the table of 4?
Multiplication Table of 4
| 4 | x | 4 |
|---|---|---|
| 4 | x | 32 |
| 4 | x | 36 |
| 4 | x | 40 |
| 4 | x | 44 |
What is the double and halve strategy?
To use halving and doubling, you simply half one of the factors and double the other. Take this example. To solve 25×16, we could double the 25 to make 50 and then half the 16 to make 8. Suddenly this problem becomes much easier to solve!
How do you think of a number and double it?
“Think of a number, double it. Add four. Halve your answer. Take away your original number. The number you now have is 2.” Try it yourself. Try it again with another starting number – the answer is ALWAYS 2. Maybe when you use it on your friends you want to don’t repeat it, else you’ll spoil the trick.
How can I Help my Child double/halve?
Ideally, all children will have access to practical equipment that they could use to help them double/halve. Each time the dice is rolled, allow time for learners to double and halve that number, perhaps recording on a mini whiteboard, before asking what number they will add to the running total.
How do you play double numbers with two players?
This is a game for two players. You will need a dice (1-6 or 0-9), or you could use our interactive dice. Decide on a target number. This is the total that both players are trying to make. Player 1 throws the dice. They can choose whether to double the number shown or halve the number shown. Player 2 throws the dice.
How do you do the “think of a number” trick?
“Think of a Number” Trick – how do you do it? “Think of a number” then they get you to add on something, double it, take away something, add 5, halve it, etc, etc, and then they tell you the number you now have? WOW! How do they do that?