How Can You Use Doubles When Multiplying With 4?

The double of 4 is 8 .

What is the double of 4?

The double of 4 is 8 .

What is the rule for multiplying by 4?

Example 1:

Step 1: Find the number that you are multiplying by 4. In this problem, that number is 3 . Step 2: Double that number once: 3 doubled is 6. Step 3: Using the answer from the first doubling (in this case, 6), double that: 6 doubled is 12.

How can you use 2’s facts to find 4 8?

Multiplying by 4 using the doubles strategy utilizes the fact that 4 is double of 2. Hence, 4 time any number is double of 2 times that number. Thus, given 4 x 8, it can be evaluated using the double strategy as follows 2 x 8 + 2 x 8 = 16 + 16 = 32 .

What are doubles facts?

Memorizing doubles facts will help them manipulate numbers and empower them to use multiple strategies to approach math problems. Review with your children that a doubles fact is a number sentence that repeats the same addend , such as 3 + 3 = 6 or 8 + 8 = 16.

How do you explain doubles plus one?

Doubles plus 1 is a strategy used to add two consecutive numbers that is, when they are next to each other. We simply add the smaller number twice or double it and then, add 1 to it, to get the final result . Here, for example, consecutive numbers 8 and 9 have been added using the doubles plus one strategy.

How do you learn the 4 times table?

1. Give plenty of practice on 2s,3s and 4s together. This really helps with higher tables, and 5 will come as light relief.
2. Use two 2p pieces as units of 4 maths aids if you need to. These can then be split to reinforce the idea of doubling 2 and halving 4.

How do I teach my child to double?

As a teacher, my favourite way to introduce doubles is using a mirror . I would give each child a mirror and ask them to hold up one finger. Seeing the reflection of their finger in the mirror would instantly demonstrate how to double one.

What is a doubles fact for 3 4?

For example, 3 + 4 is a near double as it is just a single digit away from the doubles fact 3 + 3. 10. Near doubles draw on a core understanding of doubles facts, you then add or subtract one to get a final number. 11.

What are doubles and near doubles?

Doubles are the addends that are exactly the same. These are addition facts that second graders need to know to add within 20. Near Doubles are those addends that are almost a double fact . So, 4+5 is very close to 4+4.

What is the double of 3?

The double of 3 is 6 .

How do you teach 2nd grade math facts?

1. Step 1: Break it up. Instead of overwhelming your child with all of the addition facts at once, first break the facts into smaller groups. ...
2. Step 2: Visualize and strategize. ...
3. Step 3: Practice those facts until they’re mastered. ...
4. Step 4: Mix those facts with other facts.

What is the double double strategy multiplication?

Doubling a number twice is the same as multiplying by 4 . A useful strategy for multiplying by 4 is to double the other amount twice. This strategy relies on knowing the 2x number facts, including some facts beyond the basic single-digit multiplication facts. For example: 8 x 4 =

Which is the doubles plus one fact for 6 6?

Use doubles facts to help you find sums. If you know 6 + 6, you can find 6 + 7 . 7 is 1 more than 6. So 6 + 7 is 1 more than 6 + 6.

Can you always use doubles to multiply?

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 I teach my year 2 to doubling?

1. Multiplication and Division.
2. Commutativity (part 2), doubling and halving.

What are the divisibility rules for 4?

The basic rule for divisibility by 4 is that if the number formed by the last two digits in a number is divisible by 4, the original number is divisible by 4 ; this is because 100 is divisible by 4 and so adding hundreds, thousands, etc. is simply adding another number that is divisible by 4.

What is a 4s fact in math?

The 4’s facts can be thought of as the doubles’ doubles . For example, when you have an equation like 4×5, you can double the 5 to make 10, and then double the 10 to make 20. For 4×6, find the double of 6 (12), and then double the 12 to make 24. It’s also very important to reinforce the commutative property.

What is the table of 4?

What are the factors of 4?

• Factors of 4: 1, 2, and 4.
• Negative Factors of 4: -1, -2 and -4.
• Prime Factorization of 4: 4 = 2 ²

How can I help my child memorize multiplication tables?

1. Step 1: Break up the facts into manageable chunks.
2. Step 2: Make the facts concrete with a simple visual.
3. Step 3: Teach your child to use easier facts as stepping stones to the harder facts.
4. Step 4: Practice each times table on its own until it’s mastered.