Add 5-digit whole Unit 2.2 numbers


Mental Maths


1 Round off to the nearest 10 and 100: a 3 405 e 7 916 i 25 025


b 4 149 f 8 025 j 50 003


2 Add as fast as you can: a 12 345 + 10 d 47 682 + 40 g 75 930 + 70 j 12 345 + 100 m 47 682 + 400 p 75 930 + 700 s 12 345 + 1 000 v 47 682 + 4 000 y 75 930 + 7 000


b 26 524 + 20 e 57 871 + 50 h 86 956 + 80 k 26 524 + 200 n 57 871 + 500 q 86 956 + 800 t 26 524 + 2 000 w 57 871 + 5 000 z 86 956 + 8 000


b 234 + 76 e 678 + 42


c 5 751 g 9 050 k 75 274


d 6 284 h 10 075 l 99 994


c 36 063 + 30 f 65 479 + 60 i 90 918 + 90 l 36 063 + 300 o 65 479 + 600 r 90 918 + 900 u 36 063 + 3 000 x 65 479 + 6 000


3 Add by rounding off to the nearest 10 and compensating: a 123 + 87 d 567 + 57


Rounding off whole numbers to the nearest 1 000


Whenever you add 5-digit whole numbers, follow these steps: 1 Estimate the answer. 2 Use an addition method to work out the answer. 3 Check your answer by using subtraction.


Rounding off to the nearest 1 000: 1 Underline the thousands digit. 2 If the hundreds digit is 5, 6, 7, 8 or 9, increase the thousands digit by 1. If the hundreds digit is 0, 1, 2, 3 or 4, leave the thousands digit as it is.


3 Change all digits to the right to 0. Unit 2.2: Add 5-digit whole numbers 95


c 456 + 64 f 789 + 31


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