{"id":400,"date":"2023-09-25T14:12:32","date_gmt":"2023-09-25T14:12:32","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=400"},"modified":"2023-09-25T14:13:59","modified_gmt":"2023-09-25T14:13:59","slug":"week-8-jss-1-second-term-mathematics-lesson-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-8-jss-1-second-term-mathematics-lesson-notes\/","title":{"rendered":"Week 8 – Jss 1 Second Term Mathematics Lesson Notes"},"content":{"rendered":"

WEEK 7 MID TERM
\nPERIODIC TEST.
\nWEEK 8<\/strong>\u00a0\u00a0\u00a0\u00a0ADDITION AND SUBTRACTION (DIRECTED NUMBERS
\n<\/strong>
\n\u00a08.1\u00a0\u00a0\u00a0\u00a0ADDITION AND SUBTRACTION OF DIRECTED NUMBERS.
\n<\/strong>\u00a0\u00a0\u00a0\u00a0<\/strong>In a horizontal number line:
\n<\/strong><\/p>\n

    \n
  1. When adding, start<\/strong> from the first number, count right along the number line.
    \n\t\t\t\t<\/strong><\/li>\n
  2. \n
    When subtracting, start <\/strong>from the first number, count left along the number line.
    \n\t\t\t\t\t<\/strong><\/div>\n

    \u00a0NOTE: that in a horizontal number line, number to the right of zero are positive and to the left are negative.
    \n<\/strong><\/li>\n<\/ol>\n

    Example 8.1:<\/strong> use number line to find the value of the (a) 3 + 5, (b) -4 \u2013 6, (c) -9 + 12
    \nSolution:
    \n<\/strong>\"\"\/<\/p>\n

      \n
    1. \"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/
      \n\t\t\t<\/strong><\/li>\n<\/ol>\n

      -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12
      \n<\/strong> 3 + 5 = 8
      \n\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/
      \n\t\"\"\/\"\"\/\"\"\/ (b)
      \n-11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3
      \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(-4 )\u2013(-6) = -10
      \n\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/<\/p>\n

        \n
      1. \n
        \"\"\/\n\t\t\t<\/div>\n

        -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3<\/p>\n

        \u00a0-9 + 12 = 3\n<\/li>\n<\/ol>\n

        \u00a0
        \n\u00a0
        \n\u00a0
        \n\u00a0
        \n\u00a0DO THESE:
        \n<\/strong><\/p>\n

          \n
        1. Draw a suitable horizontal number line to answer the following\n<\/li>\n
        2. 5 \u2013 8\n<\/li>\n
        3. 6 \u2013 2\n<\/li>\n
        4. (-5) \u2013 (-8)\n<\/li>\n
        5. 7 + 2\n<\/li>\n
        6. \n
          5 + 8\n<\/div>\n

          \u00a0<\/li>\n<\/ol>\n

          2.\u00a0\u00a0\u00a0\u00a0Use the rules to answer the following<\/p>\n

            \n
          1. +5 – (+6)\n<\/li>\n
          2. 25 + (-55)\n<\/li>\n
          3. +24 + (+28)\n<\/li>\n
          4. 18 \u2013 68\n<\/li>\n
          5. -7 + 5 – 2 + 7 -10 -3\n<\/li>\n<\/ol>\n

            \u00a08.2\u00a0\u00a0\u00a0\u00a0RULES FOR ADDITION AND SUBTRACTION
            \n<\/strong>NOTE:<\/strong> You can carry out the addition and subtraction without drawing the number line using the rules below.<\/p>\n

              \n
            1. \n
              Replace the same signs <\/strong>that appear together by a positive sign. [+ + = +],[ – – = -].\n<\/div>\n

              Examples +7 + (+5) = 7+5 = 12 (same sign gives +)
              \n\u00a0\u00a0\u00a0\u00a0+6 \u2013 (-8) = 6 + 8 = 14 (same sign gives +)\n<\/li>\n

            2. \n
              Replace two different signs <\/strong>that appear together by a negative sign. [+ – = -],[- + = -].\n<\/div>\n

              Examples +8 + (-5) = 8 \u2013 5 = 3 [different sign gives negative]
              \n\u00a0\u00a0\u00a0\u00a0 +9 \u2013 (+4) = 9 \u2013 4 = 5 [different sign gives negative sign].
              \nNote :<\/strong>To subtract two numbers with different signs, subtract the smaller number from the larger number and then place the sign before the larger number in front of your answer.\n<\/li>\n<\/ol>\n

              \u00a0
              \n\u00a0Example 8.2:<\/strong> Find the value of the following<\/p>\n

                \n
              1. (+6) + (+9)\n<\/li>\n
              2. (+21) \u2013 (+9)\n<\/li>\n
              3. (+12) + (-5)\n<\/li>\n
              4. (+29) + (+13)\n<\/li>\n<\/ol>\n

                Solution:
                \n<\/strong>Note: You need to follow the rules.
                \n<\/strong><\/p>\n

                  \n
                1. (+6) + (+9) = 6 + 9 = 15 (same sign gives +)\n<\/li>\n
                2. (+21) \u2013 (+9) = 21 \u2013 9 = 12 [different sign gives negative sign]\n<\/li>\n
                3. (+12) + (-5) = 12 \u2013 5 = 7 [different sign gives negative sign]\n<\/li>\n
                4. (+29) + (+13) = 29 + 13 = 42 (same sign gives +)\n<\/li>\n<\/ol>\n

                  \u00a0ASSIGNMNET:
                  \n<\/strong>EXERCISE 10.2 NO 3(A,C,E, M,O) PAGE 114
                  \nEXERCISE 10.3 NO 2( E,F,G,H), NO 5 ( A,B,C,D), PAGE 116 and 117<\/p>\n","protected":false},"excerpt":{"rendered":"

                  WEEK 7 MID TERM PERIODIC TEST. WEEK 8\u00a0\u00a0\u00a0\u00a0ADDITION AND SUBTRACTION (DIRECTED NUMBERS \u00a08.1\u00a0\u00a0\u00a0\u00a0ADDITION AND SUBTRACTION…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,66],"tags":[],"class_list":["post-400","post","type-post","status-publish","format-standard","hentry","category-posts","category-second-term-jss1-mathematics"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/400","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=400"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/400\/revisions"}],"predecessor-version":[{"id":401,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/400\/revisions\/401"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}