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The digit sum of 436 is:
The digit sum of a 2figure number is 4 and the difference between its digits is 5. Which of these could be the number?
The digit sum of 6489951 is:
9 is added to a number. The digit sum of the result: is:
Which is true for all positive numbers (more than 1 answer here):
The digit sum of a 2figure number is 3 and the first figure is twice the second, what is it (more than 1 answer here)?
37 + 48 = 85. What is the corresponding digit sum check?
347 x 8 = 2776. What is the corresponding digit sum check?
Which appear correct, judging by their first figures? (more than 1 answer here):
Which appear correct, judging by their last figures?
Add mentally from left to right: 537 + 439
Multiply mentally from left to right: 87 x 8
Multiply mentally from left to right: 3457 x 6
Use doubling and halving to find: 35 x 74
In using this doubling and halving what is the BEST situation in which to use it?
COULD this doubling/halving method be used to find, say, 35 x 43?
Subtract from left to right: 638 – 349
Subtract from left to right: 8470 – 5846
In finding 8470 – 5846 from left to right, how many times is it necessary to reduce the column difference by 1?
535 – 347 = 188. What is the corresponding digit sum check?
671 – 487 = 184. What is the corresponding digit sum check?
What is the remainder when 6399973 is divided by 9?