Use subtraction:
987 - 89:
Line up our numbers vertically:
| 9 | 8 | 7 | |
| _ | 8 | 9 |
| 17 | |||
| 9 | 8 | ||
| _ | 8 | 9 | 8 |
Column 1:
7 - 9 is < 0, we need to borrow 10.
Column 1: 10 + 7 - 9 = 8
| 17 | 17 | ||
| 9 | |||
| _ | 8 | 9 | 9 | 8 |
Column 2: 8 - 8 is <= 0, and we needed to borrow on the last column.
Therefore, we need to subtract 1 for the borrow in the previous column, and then add 10 for another borrow for this column. Total borrowing is 10 - 1 = 9.
Column 2: 9 + 8 - 8 = 9
| 8 | 17 | 17 | |
| _ | 8 | 9 | 8 | 9 | 8 |
Column 3:
Since we borrowed on the last column, we take it out of 9
Column 3: 9 - 1 - 0 = 8
Excel or Google Sheets formula:
Excel or Google Sheets formula:=987 - 89Final Answer
Answer = 987 - 89 = 898
Common Core State Standards In This Lesson
K.OA.A.5, 1.NBT.C.4, 1.NBT.C.5, 2.NBT.B.5, 2.NBT.B.6, 2.NBT.B.7, 2.NBT.B.8, 2.NBT.B.9, 3.OA.A.2, 3.NBT.A.2, 3.NBT.A.3, 4.NBT.B.4, 4.NBT.B.5, 4.NBT.B.6, 5.NBT.B.5, 5.NBT.B.6, 5.NBT.B.7, 7.NS.A.2.D
What is the Answer?
898
How does the Basic Math Operations Calculator work?
Free Basic Math Operations Calculator - Given 2 numbers, this performs the following arithmetic operations:
* Addition (Adding) (+)
* Subtraction (Subtracting) (-)
* Multiplication (Multiplying) (x)
* Long division (Dividing) with a remainder (÷)
* Long division to decimal places (÷)
* Partial Sums (Shortcut Sums)
* Short Division
* Duplication and Mediation
This calculator has 2 inputs.
* Addition (Adding) (+)
* Subtraction (Subtracting) (-)
* Multiplication (Multiplying) (x)
* Long division (Dividing) with a remainder (÷)
* Long division to decimal places (÷)
* Partial Sums (Shortcut Sums)
* Short Division
* Duplication and Mediation
This calculator has 2 inputs.
What 4 formulas are used for the Basic Math Operations Calculator?
What 10 concepts are covered in the Basic Math Operations Calculator?
- addition
- math operation involving the sum of elements
- basic math
- Elementary math subject to help students understand fundamentals, before moving on to more difficult subjects
- basic math operations
- long division
- a standard division algorithm suitable for dividing multi-digit numerals that is simple enough to perform by hand.
- multiplication
- math operation involving the product of elements
- operations
- partial
- A part of a whole. Incomplete.
- remainder
- The portion of a division operation leftover after dividing two integers
- subtraction
- math operation involving the difference of elements
- sum
- the total amount resulting from the addition of two or more numbers, amounts, or items
