Whole numbers include the positive counting numbers 1, 2, 3 and so on as well as zero and all the negative numbers –1, –2, –3 etc.
The mathematical name for whole numbers is integers.
Mathematical operations are addition, subtraction, multiplication and division. Some of the words that we use for these operations include:
What is the sum of 345 and 678? (Line up the columns.)
Answer:
345 |
+ 678 |
1023 |
What is the difference between 678 and 345? (Line up the columns.)
Answer:
678 |
– 345 |
333 |
What is 64 × 25? (Multiply by 5 first, and then multiply by 20 which is 10 × 2.)
Answer:
64 |
× 25 |
320 |
+ 1280 |
1600 |
Share 180 amongst 15 people.
Answer:
12 | |
15 | 180 |
–15↓ | |
30 –30 | |
0 |
The label of a 375 ml can of cola drink states that it contains 40 grams of sugar. One teaspoon contains about 5 grams. How many teaspoons of sugar is this?
Answer
8
Calculate these. What's the pattern? How do they work?
1 × 1 =
11 × 11 =
111 × 111 =
1111 × 1111 =
11111 × 11111 =
1 × 8 + 1 =
12 × 8 + 2 =
123 × 8 + 3 =
1234 × 8 + 4 =
12345 × 8 + 5 =
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