Aussie Maths & Science Teachers: Save your time with SmarterEd
A company has 3706 computers in a warehouse.
Another 423 computers are delivered to the warehouse.
Which of these could be used to calculate the correct number of computers in the warehouse?
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3000 + 4000 + 700 + 20 + 6 + 3 |
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3000 + 700 + 400 + 20 + 60 + 3 |
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3000 + 700 + 400 + 20 + 6 + 3 |
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3000 + 400 + 70 + 20 + 6 + 3 |
`3000 + 700 + 400 + 20 + 6 + 3`
`3706 + 423`
`= 3000 + 700 + 6 + 400 + 20 + 3`
`=3000 + 700 + 400 + 20 + 6 + 3`
| `29 + 37` has the same value as `30 +` |
`36`
| `29 + 37` | `= (29 + 1) + (37 – 1)` |
| `= 30 + 36` |
| `26 + 47 =` |
`73`
| `26+47` | `=66+7` |
| `=73` |
| `37 + 18 =` |
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| `43` | `54` | `55` | `515` |
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`55`
| `37+18` | `=47+8` |
| `=55` |
| `13 +` | `= 48` |
`35`
`13+ 35 = 48`
`=>\ text(Missing number is 35.)`
Which of these gives the largest total?
| `40 + 500` | `6 + 600` | `30 + 600` | `7 + 500` |
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`30 + 600`
| `40+500` | `=540` |
| `6+600` | `=606` |
| `30+600` | `=630` |
| `7+500` | `=507` |
`:.\ text(The highest total is: 30 + 600 = 630)`
| `13 +` | `+ 12 = 53` |
`28`
`text(Rearrange the number sentence:)`
| `53 – 13 – 12` | `= 53 – 25` |
| `= 28` |
| `:.\ \ ` |
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`= 28` |
John wants to find the answer to `2998 + 1567`.
Which of the following shows a way to get the same answer?
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`3000 + 1566` |
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`3000 + 1565` |
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`3004 + 1500` |
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`3004 + 1600` |
`3000 + 1565`
`text(By adding and subtracting 2:)`
| `2998+1567` | `=2998+2+1567-2` |
| `=3000 + 1565` |