For question 2, you can also approximate the answer without calculating the problems in their entirety. A: 1/3 is a bit less than 1/2, so 1/2 + 1/3 is a bit less than 1 B: 0.8 × 1.1 will be between 0.8 and 1.1, since 0.8 is less than 1 (so 1.1 times it will be less than 1.1) and 1.1 is more than 1 (so 0.8 times it will be more than 0.8) C: 2-1/2 will be 1.5 D: sqrt(9) is 3, so 3 minus a bit is 2 point something Doing it this way saves some time if you don't have a calculator, or if your calculator isn't fond of non- decimal numbers.
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Question number 5 answer is D 21, as you calculated 2+3+1=7 which is 6 not 7. You should add each triangle alone and repeat the same pattern.
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Awesome job 👏!
For question 2, you can also approximate the answer without calculating the problems in their entirety.
A: 1/3 is a bit less than 1/2, so 1/2 + 1/3 is a bit less than 1
B: 0.8 × 1.1 will be between 0.8 and 1.1, since 0.8 is less than 1 (so 1.1 times it will be less than 1.1) and 1.1 is more than 1 (so 0.8 times it will be more than 0.8)
C: 2-1/2 will be 1.5
D: sqrt(9) is 3, so 3 minus a bit is 2 point something
Doing it this way saves some time if you don't have a calculator, or if your calculator isn't fond of non- decimal numbers.
Great point 👍! Thanks for sharing your solution!