What is the missing tens digit in the second addend in the column addition?
'7' ✓
What is the missing ones digit in the second addend in the column addition?
'6' ✓
What is the sum of the two numbers?
105
115
125 ✓
135
What would be a good estimate for the sum of 149 + 152?
200
300 ✓
350
400
Which of these calculations would it be more efficient to calculate mentally?
648 + 257
435 + 285
199 + 352 ✓
320 + 120 ✓
Which calculations will give a sum that is even?
547 + 325 ✓
396 + 207
485 + 352
764 + 188 ✓
Exit quiz
Estimate the answer to 287 + 109 =
Which hundreds number is closest to the answer?
300
400 ✓
500
600
Estimate the answer to each calculation.
Which have answers close to 800?
399 + 398 ✓
325 + 326
489 + 205
649 + 152 ✓
Which calculations will give a sum that is odd?
566 + 328
278 + 456
742 + 199 ✓
445 + 334 ✓
Which two of these numbers have a sum of 633?
108
218 ✓
325
415 ✓
What is the missing tens digit?
'6' ✓
What is the missing addend?
'153' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
Estimate the answer first to improve your accuracy.
Start with the numbers with the smallest place value so that regrouping can be represented.
Use strategies to check, recognising when the answer should be odd or even.
Common misconception
Pupils may spend too long trying to make a very accurate estimate for their calculations.
Pupils need to understand that an estimation should be quick and easy to calculate. Encourage them to think about the nearest hundreds numbers so that these can be added together very quickly to give a value close enough to the answer.
Keywords
Estimate - Estimation means to find a value that is close enough to the right answer, usually with some thought or calculation involved.
Regroup - The process of unitising and exchanging between place values is known as regrouping.
What is the missing tens digit in the second addend in the column addition?
What is the missing ones digit in the second addend in the column addition?
What is the sum of the two numbers?
