Wednesday Learn these


9 × 10 = 90


10 × 10 = 100 11 × 10 = 110 12 × 10 = 120


2 Multiply (a)


10 × 10 (c) 9 × 10 (d) 3 Problems with brackets (b) 12 × 10 11 × 10


(a) (3 × 10) + 3 = (c) (10 × 10) + 5 = (e) (5 × 10) + 4 = (g) (11 × 10) − 2 = (i) (12 × 10) − 5 = (k) (2 × 10) − 6 =


4 Problem-solving with tables


For each problem, say whether it is a +, −, × or ÷ problem. Using your tables, write the number sentence and the answer.


Problem:


(a) An alarm clock rings every six minutes. How many times will it ring in one hour (60 minutes)?


(b) This is 10 1 of Gerry’s


money. How much money does Gerry have?


(c) A roll of wallpaper costs €8. Faye needs 10 rolls


to cover her walls. How much will this cost?


Rough work


(b) (4 × 10) + 1 = (d) (1 × 10) + 1 = (f) (0 × 10) + 2 = (h) (7 × 10) − 3 = (j) (6 × 10) − 1 = (l) (9 × 10) − 2 =


r o A u f o +, −, × or ÷? Number sentence: Answer:


1 Factor trees (a) 20


(b) 60


(c) 90


(d) 120


(e) 110


18


Strand: Number Strand Unit: Counting and numeration; Operations – multiplication Strand: Measures Strand Units: Money, Time Skill: Problem-solving.


Week 4 | Multiply by 10


t


C


D


e . g


o


C


.


r .


t ' yn S


R


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