'All subtraction statements have an equivalent addition statement' explain with two examples
Answers
Step-by-step explanation:
Addition and subtraction are two of the ways we work with numbers. We call them arithmetical operations. The word operation comes from the Latin ‘operari’, meaning to work or toil. Of the four arithmetical operations on numbers, addition is the most natural.
Subtraction and addition are inverse operations.
For example, 6 = 4 + 2 is equivalent to 6 − 4 = 2 and also 6 − 2 = 4.
The ability to add numbers in your head is used when you play, or watch sport and when you buy a couple of items at the shops.
Formal or written algorithms are useful when larger numbers make mental calculations difficult. While there are many ways to calculate with arithmetic, the commonly taught algorithms have remained in constant use because they provide an accurate and efficient means to the answer. It is usual for children to develop some basic mental strategies before they are taught formal algorithms.
A student will not develop a number-sense, or fluency with operations, if they move to calculators too quickly. Once an understanding of numbers has been developed, calculators and computers can be used with some confidence that any data-entry errors that are inconsistent with our number sense will be identified. A relatively common example of someone working without a sense of number is the person at the check-out who tries to charge a large sum for an inexpensive item simply because the cash register tells them to, without pausing to think that perhaps the code for the item was incorrect.
The development of solid understanding of addition and subtraction is essential for the development of later concepts including other arithmetical operations, calculations arising from measurements and algebra.