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The second subtraction calculation we will do with the abacus, for the benefit of parents of children who attend the Math Genie abacus math classes at any of the two schools situated in New Jersey in the USA, is twelve minus six which equals six. In the same there are not enough ones to subtract from. Consequently, as in the example above one ten must be borrowed. With the forefinger one ten is taken off and the remainder four ones are put in by putting in a five counter and taking off a one counter in the ones' place. The third subtraction calculation we will do with the abacus is one hundred minus fifty eight which equals forty two. In subtraction involving two place, three place numbers and above, always commence from the left to the right as in the case of addition. In this case subtract five tens of the number fifty eight from the tens. However, as there are no tens, one hundred is borrowed in a same manner as in the previous example. Next, in subtracting eight ones, as there are no ones left, one ten must be borrowed. Eight is subtracted and two ones, the remainder, are put in by the same method as in the previous example. Now an explanation of how to conduct multiplication exercises using the abacus. The determination of a unit position in the product during an abacus math multiplication calculation. In such case where the multiplier is the integral or mixed decimal number, for example three point five six, nineteen point three six two and so on, count figures in the integral part of the multiplier. Count off equal number of uprights, from the unit position of the multiplicand, toward the right, this upright is the unit position for the product. In case the multiplier is a decimal number, except the mixed-decimal number and there are some zeros between the decimal point and the decimal-significant figure one to nine. Count a number of zero between the decimal point and the decimal significant figure of the multiplier. Count off an equal number of uprights, from the unit position of the multiplicand, toward the left, this upright is the unit position for the product. In such case where the multiplier is the decimal number and there is no zero between the decimal point and the decimal-significant number the unit position of the multiplicand is the unit position for the product. Let us now multiply sixty seven by two which gives an answer of one hundred and thirty four. Compare the last figure of the multiplicand, namely seven on the upright B, with the multiplier two. Two times seven equals fourteen, therefore, after taking off seven from the upright B, place one, the first figure of fourteen, on the upright B and place four, the second figure, on the upright C. Next, compare six, another figure in the multiplicand, with the multiplier two. Two times six equals twelve, therefore, after taking off six from the upright A, place one, the first figure of twelve, on the upright A, then add two, the second figure, to one on the upright B. The product and answer is one hundred and thirty four. Visit Math For Kids Problems Abacus Lessons Everyday Cool Games Private Tutors to contact Math Genie and enroll your child to improve their math ability.
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