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Revision Estimate and then count the objects. 1. OOOOOOOOOO a) Estimated b) counted Fill in the missing numbers 2. a 2, , 6, 8, 10

Mathematics

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Here are the solutions to the problems:

1. Estimate and then count the objects.
The objects are a row of '0's: 000000000000

  • a) Estimated: I will estimate the number of '0's.
    • Estimated: 10\boxed{\text{10}}
  • b) Counted: Now, I will count them precisely.
    • Counted: 12\boxed{\text{12}}

2. Fill in the missing numbers.

  • a) The sequence is 2, __, 6, 8, 10. This is a sequence where each number increases by 2.

  1. Identify the pattern.

    $6 - 2 = 4$  
$8 - 6 = 2$  
$10 - 8 = 2$  
The common difference is 2.

  2. Find the missing number.

    $2 + 2 = 4$  
The missing number is $\boxed{\text{4}}$.
    • b) The sequence is 10, 20, 30, __. This is a sequence where each number increases by 10.

  3. Identify the pattern.

    $20 - 10 = 10$  
$30 - 20 = 10$  
The common difference is 10.

  4. Find the missing number.

    $30 + 10 = 40$  
The missing number is $\boxed{\text{40}}$.
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