Starter quiz
- Complete: ______ is 3,000 more than 6,000
- '9,000' ✓
- 1,306 + 400 = ______
- '1,706' ✓
- Two plus three is equal to five so two thousand plus three thousand is equal to ___
- 5
- 50
- 500
- 5,000 ✓
- 50,000
-
- ______ is forty thousand less than ninety thousand. Give your answer as a numeral using digits.
- '50,000' ✓
- 6,709 − 3,000 = ___
- 3,709 ✓
- 6,409
- 6,739
- 9,709
-
- Lucas thinks of a number. His number is 5,100 more than 13,215 What is his number?
- '18,315' ✓
Exit quiz
- 3,901,481 + 3,000 = ___
- 3,091,781
- 3,931,481
- 3,903,481
- 3,904,481 ✓
-
- Complete: 8,940,305 − 300,000 = ______
- '8,640,305' ✓
- Match the addends to their sum.
- 4,451,038 + 2,000,000 =⇔6,451,038 ✓
- 4,451,038 + 200,000 =⇔4,651,038 ✓
- 4,451,038 + 20,000 =⇔4,471,038 ✓
- 4,451,038 + 2,000 =⇔4,453,038 ✓
- 4,451,038 + 200 =⇔4,451,238 ✓
- 7,154,302 + 500,000 − 400,000 = ______
- '7,254,302' ✓
- Match the equations to their difference.
- 8,296,792 − 31,000 =⇔8,265,792 ✓
- 8,296,792 − 31,500 =⇔8,265,292 ✓
- 8,296,792 − 31,520 =⇔8,265,272 ✓
- 8,296,792 − 31,524 =⇔8,265,268 ✓
- Lucas thinks of a number. His number is 561,000 less than 3,994,314 What number is Lucas thinking of?
- '3,433,314' ✓
Worksheet
Presentation
Video
Lesson Details
Key learning points
- Known facts to 10 can be applied when adding and subtracting 100s, 1,000s, 10,000s and 100,000s
- When adding and subtracting mentally, the language of unitising supports us in addition to using known facts.
- An understanding of the structure of numbers and place value supports when we add and subtract mentally.
Common misconception
Children may believe that only one digit will change when adding two numbers where one addend has only one non-zero digit.
This is usually correct but what would happen if the digit changed to a value of 10 or greater? Then we would need to regroup (another lesson).
Keywords
Addend - An addend is a number added to another. They are also known as the parts.
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