=4023 how do u this question (plz answer the question without calculator)
Answers
The first trick is to simplify your problem by breaking it into smaller pieces. For example, we can rewrite
567 + 432
= 567 + (400 + 30 + 2)
= 967 + 30 + 2
= 997 + 2
= 999
Switch
It’s often easier to work with adding a smaller number, so instead of 131 + 858, swap the numbers
858 + 131
= 858 + 100 + 30 + 1
= 989
2. Subtraction
Using the complement of a number can help make subtraction easier. The complement is the difference between the original number and a round number — say 100, 1000.
Here are some examples with the number and its complement compared with 100:The first trick is to simplify your problem by breaking it into smaller pieces. For example, we can rewrite
567 + 432
= 567 + (400 + 30 + 2)
= 967 + 30 + 2
= 997 + 2
= 999
Switch
It’s often easier to work with adding a smaller number, so instead of 131 + 858, swap the numbers
858 + 131
= 858 + 100 + 30 + 1
= 989
2. Subtraction
Using the complement of a number can help make subtraction easier. The complement is the difference between the original number and a round number — say 100, 1000.
Here are some examples with the number and its complement compared with 100: