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Table of Contents

- How do you teach addition fun?
- How do you teach addition without regrouping?
- What does addition with regrouping mean?
- What is a 3 digit?
- What is the largest 3 digit number divisible by 3?
- What is the highest number you can make using 3 digits?
- How many 3 digit combinations are there?
- How do you pick a 3 digit lock?
- How do you open a combination lock without the code?
- How do you open a 4 digit combination safe?
- How do combination locks work?
- Are combination locks safe?
- Can combination locks be reset?
- Are combination locks Left Right Left?
- How do you open a left left lock?

Try these fun addition activities in the classroom or at home to help your students become math wizards in no time!

- Build block towers.
- Make a dice calculator.
- Play a game of addition Jenga.
- Create an addition apple tree.
- Use stickers for hands-on practice.
- Park and add some toy cars.
- Thread beads onto pipe cleaners.

How to Add without Regrouping

- Place the addends one on top of the other so that the place values fall in the same columns.
- Add each column together separately, starting with the 1s place.
- The sums go below each column, underneath the line.

In math, regrouping can be defined as the process of making groups of tens when carrying out operations like addition and subtraction with two-digit numbers or larger. We use regrouping in addition when the sum of two digits in the place value column is greater than nine.

Three digit numbers are from 100 to 999. We know that there are nine one-digit numbers, i.e., 1, 2, 3, 4, 5, 6, 7, 8 and 9. In making two digit numbers, zero (0) is also utilized along with digits 1 to 9. In two digit numbers one digit represents number of ones and the other represent the number of tens.

996

999

If each digit in a 3-digit lock contains the numbers 0-9, then each digit has 10 options, and 1,000 different combinations are possible.

WonderHowTo

- Put pressure on the lock by sliding it across the bail as far as it will go.
- Rotate each digit until it gets very hard to move.
- If it gets really hard, try one more click. If it becomes easy again, just put it back to where it is hard.
- Keep pressure on the bail, and try moving the numbers one at a time.

Pull up gently on the shackle and hold it in place. Turn the dial clockwise listening carefully until you hear the lock click. Start with a good deal of pressure and gently let up as you spin it around, until you meet resistance in only one place. If the dial catches every few numbers, you are pulling too hard.

To unlock a true 4 number combination

- Starting anywhere, turn the dial right (clockwise), stopping when the first combination number comes to the opening index the FIFTH time.
- Turn the dial left (counterclockwise), stopping when the second number comes to the opening index the FOURTH time.

The typical combination lock has a combination dial that is attached to a spindle. Inside the lock, the spindle runs through several wheels and a drive cam. Each wheel on the spindle has a notch cut into it. When the right combination is dialed, all the wheels and their notches line up perfectly.

Wrapping Up. So, yes it’s true: combination locks are less secure than keyed locks. But if you get a decent one with 4 or 5 dials and features that resist the most basic decoding techniques, then in the street, in most instances they are going to offer the same levels of protection as a decent keyed lock.

A: Unfortunately, your lock is a set-your-own combination lock. Once you have set the combination, we cannot reset it for you!

Most combinations locks like the one you have / had on your locker need to be turned right, left, then right again to enter the combination and open the lock. Watch this video to learn how you can unlock a lock with turns in the opposite direction by using a different combination.

- 1 – Have the lock combination code.
- 2 – Turn the Dial 3 times RIGHT – Stop at the first number.
- 3 – Turn the Dial LEFT 1 complete turn and past the first number – Stop at the second number.
- 4 – Turn the Dial RIGHT – Stop at the third number.
- 5 – Pull on the lock to OPEN.