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Mental Maths
21 st
1. Choose the correct option. Century #Critical Thinking
Skills
a. Adding 4 tens, 5 hundreds and 6 ones to 3867 can be expressed as:
i. 3867 + 8 + 40 + 500 ii. 3867 + 5 + 60 + 400
iii. 3867 + 40 + 500 + 6 iv. 3867 + 400 + 50 + 6
b. The greatest 3-digit number added to 12 gives:
i. 99912 ii. 12999 iii. 1011 iv. 1101
2. Express the number as a sum of + + +
other numbers:
+ + 3124 +
+
HOTS
21 st
Century #Subject Enrichment
Skills
1. Arrange the digits 1 to 9 in such a way that
the sum of the digits on each side of the
triangle is 20.
2. Write the numbers in the smiley faces 90
that add up to make the number in each 156
triangle.
108 248
200
52 Mathematics 3
