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4 March, 13:05

Use rounding or compatible numbers to estimate the sum. 222+203

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  1. 4 March, 14:10
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    Hundreds and tens are easy to add, so we can round 203 to 200, and 222 to 220.

    220+200=420, so

    222+203 rounds to about 420
  2. 4 March, 17:05
    0
    Ok, 222 is about 220, and 203 is about 200. Now, you know that 22+20=42, and you add the hundreds place, which gives you an estimate of 420.
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