Let’s say you want to add 4+5. Circle 4 on your number line, then count 5 spaces down the line. You will land on 9, which is your answer. Use your number line to add these numbers: 5+3 1+7 6+2 4+4
If you don’t have beans, you can use any small item that fits in your hand to practice addition! For example, you can use blocks, candies, coins, or legos. Use your beans to add these numbers: 5+3 2+7 3+9 4+1
You can draw any object to represent your numbers, but it’s best to choose something easy. As another option, you can use stickers! Use drawing to add these numbers: 1+7 2+5 8+6 4+3
The spot on the right is the “ones” place. The second spot from the left is the “tens” place. The third spot from the left is the “hundreds” place. Here’s an example: In the number 583, the 3 is in the ones place, the 8 is in the tens place, and the 5 is in the hundreds place.
If your problem is presented horizontally on a worksheet, it helps to rewrite it vertically to make it easier to solve.
Here’s how you’d write 16+4+342: 342 _16 +_4
For 342+16+4, you’d add 2+6+4=12. Write the 2 in your ones place in your answer. Carry the other 1 into your tens column.
In the above example, you’d write the 1 from the tens place in 12 on top of the tens column.
For 342+16+4, you’d add 4+1+1=6. Remember, the second 1 is the carry over from your ones sum. You’d write 6 down in the tens spot of your answer. You don’t have any carry over from this sum.
When you complete the last column on the left, you’ll have your final sum. In our example, you only have one number in the hundreds column, so you’d carry down the 3 to your answer. Your final sum for 342+16+4=362.
107. 8 _24. 5 __3. 2 +15. 0
Always round up because it’s easier to keep track of how much you’re adding to your original numbers as you round. Here’s an example problem: 423+678. You’d round it like this: 430 + 680 or 500+700.
In the problem listed above, you’ll count out 7 places for rounding 423 to 430 and 2 places for rounding 678 to 680. Add 7+2=9.
For the problem above, you’d add 430+680=1110
To solve the problem above, you’d subtract or count back 1110-9 =1101.
For example, let’s say you’re adding 1+8+2+7+3. You could add 8+2 = 10 and 7+3=10. That leaves you with 1+10+10=21.
You can also do this with numbers in the hundreds. You can break the number down into just the hundreds, just the tens, and just the ones. However, using one of the other techniques may be easier when adding big numbers.
For example, let’s say you’re adding -4+-6. You’d circle -4 on your number line. Then, count 6 spaces to the left. You’ll arrive at -10, which is your answer.
For example, when adding -12+-21, you could add 12+21=33. However, since your numbers were negative, you’d make your answer -33.
For instance, let’s say you’re adding 6+-8. You’ll circle 6 on your number line. Then, count 8 spaces backwards, moving to the left on your line. You’ll arrive at -2, which is your answer.
For example, 15+-17 would become 15-17=-2.
